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(1/5)*(3*x-51) = 4*x // - 4*x
(1/5)*(3*x-51)-(4*x) = 0
(1/5)*(3*x-51)-4*x = 0
1/5*(3*x-51)-4*x = 0
1/5*(3*x-51)-4*x = 0
-17/5*x-51/5 = 0
-17/5*x-51/5 = 0
-17/5*x-51/5 = 0 // + 51/5
-17/5*x = 51/5 // : -17/5
x = 51/5/(-17/5)
x = -3
x = -3
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