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3+(4x-3y)-2(y-2x) =
= 3 + 4x - 3y - 2y + 4x =
= 8x - y + 3
b)
-5(a-b)-[3(a-b)-(a-4b)] =
= -5a + 5b - (3a - 3b - a + 4b) =
= -5a + 5b - (2a + b) = -5a + 5b - 2a - b =
= -7a + 4b