Раскрой скобки и приведи подобные слагаемые:
а) -3(a+b) + 2(a-b)
б) 2(m - 4n) - 4(m - 2n)
в) 5(x-5) - 3(2x - 9)
г) 2y² - y(y-3) + y(2 - y)
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