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x in (-oo:+oo)
(-7/5)*x = 48/3 // - 48/3
(-7/5)*x-(48/3) = 0
(-7/5)*x-16 = 0
-7/5*x-16 = 0 // + 16
-7/5*x = 16 // : -7/5
x = 16/(-7/5)
x = -80/7
x = -80/7
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