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