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x in (-oo:+oo)
3*x-((1/2)*x)+10 = 40 // - 40
3*x-((1/2)*x)-40+10 = 0
3*x+(-1/2)*x-40+10 = 0
5/2*x-30 = 0 // + 30
5/2*x = 30 // : 5/2
x = 30/5/2
x = 12
x = 12
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