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x in (-oo:+oo)
(5/12)*(x+7) = (7/18)*(x+8) // - (7/18)*(x+8)
(5/12)*(x+7)-((7/18)*(x+8)) = 0
(5/12)*(x+7)+(-7/18)*(x+8) = 0
5/12*(x+7)-7/18*(x+8) = 0
5/12*(x+7)-7/18*(x+8) = 0
1/36*x-7/36 = 0
1/36*x-7/36 = 0
1/36*x-7/36 = 0 // + 7/36
1/36*x = 7/36 // : 1/36
x = 7/36/1/36
x = 7
x = 7
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