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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+210+1470 = 0
5*x+1680 = 0 // - 1680
5*x = -1680 // : 5
x = -1680/5
x = -336
x = -336
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