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(3/4)*x-12 = -4*x-31 // + -4*x-31
(3/4)*x-(-4*x)-12+31 = 0
(3/4)*x+4*x-12+31 = 0
19/4*x+19 = 0 // - 19
19/4*x = -19 // : 19/4
x = -19/19/4
x = -4
x = -4
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