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= a-7a-2+4
= 6a+2
b. = 15x-20 - 4x+12
= 15x-4x-20+12
= 11x-8
7a+4-a+2
6a+2
b. 4(x+3) - 5(3x-4)
4x+3-15x +20
-11x+23