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x in (-oo:+oo)
(1/5)*x-((1/6)*(x-7)) = 6*x // - 6*x
(1/5)*x-((1/6)*(x-7))-(6*x) = 0
(-1/6)*(x-7)+(1/5)*x-6*x = 0
x/5-1/6*(x-7)-6*x = 0
(-1/6*5*(x-7))/5+x/5+(-6*5*x)/5 = 0
x-1/6*5*(x-7)-6*5*x = 0
1/6*x-30*x+35/6 = 0
35/6-179/6*x = 0
(35/6-179/6*x)/5 = 0
(35/6-179/6*x)/5 = 0 // * 5
35/6-179/6*x = 0
35/6-179/6*x = 0 // - 35/6
-179/6*x = -35/6 // : -179/6
x = -35/6/(-179/6)
x = 35/179
x = 35/179
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