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4.25*x-9 = (7/2)*x+18 // - (7/2)*x+18
4.25*x-((7/2)*x)-18-9 = 0
4.25*x+(-7/2)*x-18-9 = 0
0.75*x-27 = 0 // + 27
0.75*x = 27 // : 0.75
x = 27/0.75
x = 36
x = 36
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