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x in (-oo:+oo)
-((60/10)*x)-150 = -250 // + 250
250-((60/10)*x)-150 = 0
250-6*x-150 = 0
100-6*x = 0 // - 100
-6*x = -100 // : -6
x = -100/(-6)
x = 50/3
x = 50/3
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