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(1/5)*(4*x-48) = 4*x // - 4*x
(1/5)*(4*x-48)-(4*x) = 0
(1/5)*(4*x-48)-4*x = 0
1/5*(4*x-48)-4*x = 0
1/5*(4*x-48)-4*x = 0
-16/5*x-48/5 = 0
-16/5*x-48/5 = 0
-16/5*x-48/5 = 0 // + 48/5
-16/5*x = 48/5 // : -16/5
x = 48/5/(-16/5)
x = -3
x = -3
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