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7*x+6/7 = (-3/4)*x+253/42 // - (-3/4)*x+253/42
7*x-((-3/4)*x)+6/7-(253/42) = 0
7*x+(3/4)*x+6/7-253/42 = 0
31/4*x-31/6 = 0 // + 31/6
31/4*x = 31/6 // : 31/4
x = 31/6/31/4
x = 2/3
x = 2/3
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