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x in (-oo:+oo)
30 = (1/5)*x+16 // - (1/5)*x+16
30-((1/5)*x)-16 = 0
(-1/5)*x-16+30 = 0
14-1/5*x = 0 // - 14
-1/5*x = -14 // : -1/5
x = -14/(-1/5)
x = 70
x = 70
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