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x in (-oo:+oo)
2*x+7 = (5*x-1)/2 // - (5*x-1)/2
2*x-((5*x-1)/2)+7 = 0
(-1*(5*x-1))/2+2*x+7 = 0
(-1*(5*x-1))/2+(2*2*x)/2+(2*7)/2 = 0
2*2*x-1*(5*x-1)+2*7 = 0
1-x+14 = 0
15-x = 0
(15-x)/2 = 0
(15-x)/2 = 0 // * 2
15-x = 0
15-x = 0 // - 15
-x = -15 // * -1
x = 15
x = 15
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