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1) 7a - 2b + 3a - 4b =
a=5 , b=3

2)4x - 2y - 8x + 6y =
x=0,2 , y=0,4

3) 3xy × 4ax =

4) -8ab × 2by =

5) 5 ×( 4 - 2x) - 4x =

6) -7 ×(5y - 8) + 56 =

7) -9 ×( 4 - 3y) + 20y =

8) -7 ×( 5 - 3x) - 21x =
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