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(1/3)*x-((4/5)*x)-5/8 = -131/120 // + -131/120
(1/3)*x-((4/5)*x)-5/8-(-131/120) = 0
(1/3)*x+(-4/5)*x-5/8+131/120 = 0
7/15-7/15*x = 0 // - 7/15
-7/15*x = -7/15 // : -7/15
x = -7/15/(-7/15)
x = 1
x = 1
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