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3*x-7 = (1/2)*x-(51/8) // - (1/2)*x-(51/8)
3*x-((1/2)*x)+51/8-7 = 0
3*x+(-1/2)*x+51/8-7 = 0
5/2*x-5/8 = 0 // + 5/8
5/2*x = 5/8 // : 5/2
x = 5/8/5/2
x = 1/4
x = 1/4
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