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(1/2)*(3*x-25) = 4*x // - 4*x
(1/2)*(3*x-25)-(4*x) = 0
(1/2)*(3*x-25)-4*x = 0
1/2*(3*x-25)-4*x = 0
1/2*(3*x-25)-4*x = 0
-5/2*x-25/2 = 0
-5/2*x-25/2 = 0
-5/2*x-25/2 = 0 // + 25/2
-5/2*x = 25/2 // : -5/2
x = 25/2/(-5/2)
x = -5
x = -5
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