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x in (-oo:+oo)
y = (1/10)*x-7 // - (1/10)*x-7
y-((1/10)*x)+7 = 0
(-1/10)*x+y+7 = 0
y-1/10*x+7 = 0 // - y+7
-1/10*x = -(y+7) // : -1/10
x = (-(y+7))/(-1/10)
x = 10*(y+7)
x = 10*(y+7)
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