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x in (-oo:+oo)
(-1/5)*x-25 = 7 // - 7
(-1/5)*x-25-7 = 0
-1/5*x-32 = 0 // + 32
-1/5*x = 32 // : -1/5
x = 32/(-1/5)
x = -160
x = -160
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