1)a-(a-(2a-4)) 2)(5a-3b)-(2+5a-3b)
3)(3x+7)/5=(6x+4)/5
4)(2x+1)/5+(3x+1)/7=2
5)ax-ay+cy-cx-x+y
6)(x-7)^2-81
7)-4x^2+8xy-4y^2
8)/2x-3/=x-5
/-модуль
заранее спсибо
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