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x in (-oo:+oo)
(3/5)*(x-10) = (4/5)*x // - (4/5)*x
(3/5)*(x-10)-((4/5)*x) = 0
(3/5)*(x-10)+(-4/5)*x = 0
3/5*(x-10)+(-4*x)/5 = 0
(3/5*5*(x-10))/5+(-4*x)/5 = 0
3/5*5*(x-10)-4*x = 0
-x-30 = 0
(-x-30)/5 = 0
(-x-30)/5 = 0 // * 5
-x-30 = 0
-x-30 = 0 // + 30
-x = 30 // * -1
x = -30
x = -30
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