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x in (-oo:+oo)
(2/7)*x+(1/2)*x = (3/5)*x+1 // - (3/5)*x+1
(2/7)*x+(1/2)*x-((3/5)*x)-1 = 0
(2/7)*x+(1/2)*x+(-3/5)*x-1 = 0
13/70*x-1 = 0 // + 1
13/70*x = 1 // : 13/70
x = 1/13/70
x = 70/13
x = 70/13
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