(Add 2 to both left and right sides of the equation)
4x-2+2=x+3+2
4x=x+5
(2) 7 to 2 times = 3 to 5 times
(both left and right sides of +2x equation)
7-2x+2x=3-5x+2x
7=3-(5x-3x)
7 = 3-2 times
(3)2x+ 10=0
(Put the left and right sides of the equation at the same time-10)
2x+ 10- 10 = 0- 10
2x=- 10
(4)9x=7x+4.8
(Put the left and right sides of the equation at the same time -7x)
9x-7x=7x+4.8-7x
2x=4.8
(5) 10x-8=8x+ 1
(Add 8 to both left and right sides of the equation)
10x-8+8=8x+ 1+8
10x=8x+9
(Put the left and right sides of the equation at the same time -8x)
10x-8x=8x+9-8x
2x=9
(6)-7x=2/3
(Use 2/3 inch to 7 inch)
(7)-2x=3x+8
(both left and right sides of +2x equation)
-2x+2x=3x+2x+8
0=5x+8
(8)3×7+6×= 4×8
(Put the left and right sides of the equation at the same time -6x)
3x-7+6x-6x=4x-8-6x
3x-7 = 4x-8x
(both left and right sides of +6x equation)
3x 7+6x = 4x 8
9x-7=4x-8
(Add 8 to both left and right sides of the equation)
9x-7+8=4x-8+8
9x+ 1=4x
② Let the middle line be A, B, C, D, the first behavior E and the third behavior F respectively.
An opposite surface c
∫c = 1
∴a=(- 1)
∫b opposite surface d
∫b = 3
∴d=(-3)
E opposite surface f
∫e =-5
∴f=5
∴ The middle lines are (-1), 3, 1 and (-3) respectively.
The first line is -5.
The third row is 5.