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x in (-oo:+oo)
(-1/5)*(125-(50*x)) = 6 // - 6
(-1/5)*(125-(50*x))-6 = 0
(-1/5)*(125-50*x)-6 = 0
-1/5*(125-50*x)-6 = 0
-1/5*(125-50*x)-6 = 0
10*x-31 = 0
10*x-31 = 0
10*x-31 = 0 // + 31
10*x = 31 // : 10
x = 31/10
x = 31/10
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