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3*x-((5/2)*x)-7 = 23 // - 23
3*x-((5/2)*x)-23-7 = 0
3*x+(-5/2)*x-23-7 = 0
1/2*x-30 = 0 // + 30
1/2*x = 30 // : 1/2
x = 30/1/2
x = 60
x = 60
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