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x in (-oo:+oo)
-12 = (3/10)*x-15 // - (3/10)*x-15
15-((3/10)*x)-12 = 0
(-3/10)*x-12+15 = 0
3-3/10*x = 0 // - 3
-3/10*x = -3 // : -3/10
x = -3/(-3/10)
x = 10
x = 10
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