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x in (-oo:+oo)
(-4/5)*x+7 = 55 // - 55
(-4/5)*x-55+7 = 0
-4/5*x-48 = 0 // + 48
-4/5*x = 48 // : -4/5
x = 48/(-4/5)
x = -60
x = -60
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