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x in (-oo:+oo)
-30 = 7*x-3*x+10 // - 7*x-3*x+10
-(-3*x)-(7*x)-30-10 = 0
3*x-7*x-30-10 = 0
-4*x-40 = 0 // + 40
-4*x = 40 // : -4
x = 40/(-4)
x = -10
x = -10
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