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(1/5)*(4*x+55) = 3*x // - 3*x
(1/5)*(4*x+55)-(3*x) = 0
(1/5)*(4*x+55)-3*x = 0
1/5*(4*x+55)-3*x = 0
1/5*(4*x+55)-3*x = 0
11-11/5*x = 0
11-11/5*x = 0
11-11/5*x = 0 // - 11
-11/5*x = -11 // : -11/5
x = -11/(-11/5)
x = 5
x = 5
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