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4*x+x-10 = 15/2 // - 15/2
4*x+x-(15/2)-10 = 0
4*x+x-15/2-10 = 0
5*x-35/2 = 0 // + 35/2
5*x = 35/2 // : 5
x = 35/2/5
x = 7/2
x = 7/2
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