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x in (-oo:+oo)
10-6*x = 40-3*x // - 40-3*x
10-6*x-(-3*x)-40 = 0
3*x-6*x-40+10 = 0
-3*x-30 = 0 // + 30
-3*x = 30 // : -3
x = 30/(-3)
x = -10
x = -10
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