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(3/4)*x-12 = (1/4)*x-9 // - (1/4)*x-9
(3/4)*x-((1/4)*x)-12+9 = 0
(3/4)*x+(-1/4)*x-12+9 = 0
1/2*x-3 = 0 // + 3
1/2*x = 3 // : 1/2
x = 3/1/2
x = 6
x = 6
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