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(3/4)*(x-9) = -12 // + 12
(3/4)*(x-9)+12 = 0
3/4*(x-9)+12 = 0
3/4*(x-9)+12 = 0
3/4*x+21/4 = 0
3/4*x+21/4 = 0
3/4*x+21/4 = 0 // - 21/4
3/4*x = -21/4 // : 3/4
x = -21/4/3/4
x = -7
x = -7
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