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