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a) x+(3x-y^{2}+7)
b)-a+(2a-3b-1)
c)-x^{2}+(x^{2}-x-7)
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a) x + (3x - y2 +7) = x + 3x - y2 + 7 = 4x - y2 + 7b) -a + (2a - 3b - 1) = -a + 2a -3b -1 = a - 3b - 1c) -x2 + (x2 - x - 7) = -x2 + x2 -x -7 = -x - 7
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a) x + (3x - y2 +7) = x + 3x - y2 + 7 = 4x - y2 + 7
b) -a + (2a - 3b - 1) = -a + 2a -3b -1 = a - 3b - 1
c) -x2 + (x2 - x - 7) = -x2 + x2 -x -7 = -x - 7