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a in (-oo:+oo)
3*a-2 = (2*a)/2+10 // - (2*a)/2+10
3*a-((2*a)/2)-10-2 = 0
3*a-a-10-2 = 0
2*a-12 = 0 // + 12
2*a = 12 // : 2
a = 12/2
a = 6
a = 6
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