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(2*x-1)/3+x-x-8.5 = 7.5 // - 7.5
(2*x-1)/3+x-x-8.5-7.5 = 0
(2*x-1)/3+(3*x)/3+(3*(-x))/3+(-8.5*3)/3+(-7.5*3)/3 = 0
2*x+3*x+3*(-x)-8.5*3-7.5*3-1 = 0
5*x-3*x-25.5-22.5-1 = 0
2*x-25.5-22.5-1 = 0
2*x-26.5-22.5 = 0
2*x-49 = 0
(2*x-49)/3 = 0
(2*x-49)/3 = 0 // * 3
2*x-49 = 0
2*x-49 = 0 // + 49
2*x = 49 // : 2
x = 49/2
x = 49/2
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