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x in (-oo:+oo)
2*x+12 = (3/4)*x+27 // - (3/4)*x+27
2*x-((3/4)*x)-27+12 = 0
2*x+(-3/4)*x-27+12 = 0
5/4*x-15 = 0 // + 15
5/4*x = 15 // : 5/4
x = 15/5/4
x = 12
x = 12
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