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x in (-oo:+oo)
(2/5)*(x+1)+(3/5)*(x+1) = 14 // - 14
(2/5)*(x+1)+(3/5)*(x+1)-14 = 0
2/5*(x+1)+3/5*(x+1)-14 = 0
2/5*(x+1)+3/5*(x+1)-14 = 0
x-14+1 = 0
x-13 = 0
x-13 = 0
x-13 = 0 // + 13
x = 13
x = 13
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