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x in (-oo:+oo)
(-1/5)*x+4 = 39 // - 39
(-1/5)*x-39+4 = 0
-1/5*x-35 = 0 // + 35
-1/5*x = 35 // : -1/5
x = 35/(-1/5)
x = -175
x = -175
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