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Math problems in junior high school (addition and subtraction of algebraic expressions)
(m+2n)-(m-2n)

=m+2n-m+2n

=4n

(2ab+5a？ -2b？ )-(a？ +2ab-2b？ )

=2ab+5a？ -2b？ -a？ -2ab+2b？

=4a？

2x-3(x-2y+3z)+2(3x-3y+2z)

=2x-3x+6y-9z+6x-6y+4z

=5x-5z

8m？ -【4m？ -2m-(2m？ -5m)]

=8m？ -【4m？ -2m-2m？ +5m]

=8m？ -【2m？ +3m]

=6m？ -3m

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