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(1/5)*(x+6) = (1/7)*(x+8) // - (1/7)*(x+8)
(1/5)*(x+6)-((1/7)*(x+8)) = 0
(1/5)*(x+6)+(-1/7)*(x+8) = 0
1/5*(x+6)-1/7*(x+8) = 0
1/5*(x+6)-1/7*(x+8) = 0
2/35*x+2/35 = 0
2/35*x+2/35 = 0
2/35*x+2/35 = 0 // - 2/35
2/35*x = -2/35 // : 2/35
x = -2/35/2/35
x = -1
x = -1
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