Нужно решить примеры: (упростить, преобразовать и т.д.)
a) 7x+3y-(-3x+3y)
b) 7*(2a-4,2)+(4-3a)
c) (3b-2)*(5-2b)+6b^2
d) (a-b)*(a+2)-(a+b)*(a-2)
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