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x in (-oo:+oo)
(2/7)*x+(1/2)*x = (3/4)*x+1 // - (3/4)*x+1
(2/7)*x+(1/2)*x-((3/4)*x)-1 = 0
(2/7)*x+(1/2)*x+(-3/4)*x-1 = 0
1/28*x-1 = 0 // + 1
1/28*x = 1 // : 1/28
x = 1/1/28
x = 28
x = 28
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