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x in (-oo:+oo)
(3/10)*x-3 = (1/4)*x // - (1/4)*x
(3/10)*x-((1/4)*x)-3 = 0
(3/10)*x+(-1/4)*x-3 = 0
1/20*x-3 = 0 // + 3
1/20*x = 3 // : 1/20
x = 3/1/20
x = 60
x = 60
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