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