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x in (-oo:+oo)
2-x-(3*x) = -30 // + 30
2-x-(3*x)+30 = 0
2-x-3*x+30 = 0
32-4*x = 0 // - 32
-4*x = -32 // : -4
x = -32/(-4)
x = 8
x = 8
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