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x in (-oo:+oo)
(3/5)*x-((2/10)*x) = (3/4)*x+4 // - (3/4)*x+4
(3/5)*x-((2/10)*x)-((3/4)*x)-4 = 0
(3/5)*x+(-1/5)*x+(-3/4)*x-4 = 0
-7/20*x-4 = 0 // + 4
-7/20*x = 4 // : -7/20
x = 4/(-7/20)
x = -80/7
x = -80/7
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