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5*x-1/2 = 15/2-5*x // - 15/2-5*x
5*x-(-5*x)-1/2-(15/2) = 0
5*x+5*x-1/2-15/2 = 0
10*x-8 = 0 // + 8
10*x = 8 // : 10
x = 8/10
x = 4/5
x = 4/5
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