c-7=12, C = 5, C = 19, C = -5, 5-x=9, x=4, x=14, x=-4, 7c=63, c=9, c=56, c=-9, 3x+7=10, x=1, x=-1, x=3, 9-5x=24, x=3, x=5.6, x=-3, 6x+5=19-x, x=2, x=4.8, x=-2, 4(2y-3) = 3(y+6), y=9, y=6, y=1.2, 6(2x-3)=4x+6, x=4, x=3, x=-3.

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