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The answer to the fifth question on page 72 of the fifth grade math book needs to solve the equation.
13.2 x+9x = 33.3 8x-3x = 105

( 13.2+9)x = 33.3(8-3)x = 105

22.2x=33.3 5x= 105

22.2 x÷22.2 = 33.3÷22.2 5x÷5 = 105÷5

x= 1.5 x=2 1

5.4x+x = 12.8 x-0.36 x = 16

(5.4+ 1)x = 12.8( 1-0.36)x = 16

6.4x= 12.8 0.64x= 16

6.4÷6.4 = 12.8÷6.4 0.64÷0.64 = 16÷0.64。

x=2 x=25

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