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x in (-oo:+oo)
-1470 = (-150/30)*x-210 // - (-150/30)*x-210
210-((-150/30)*x)-1470 = 0
5*x-1470+210 = 0
5*x-1260 = 0 // + 1260
5*x = 1260 // : 5
x = 1260/5
x = 252
x = 252
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