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(1/2)*x-3*x-4 = -3/5 // + -3/5
(1/2)*x-3*x-(-3/5)-4 = 0
(1/2)*x-3*x+3/5-4 = 0
-5/2*x-17/5 = 0 // + 17/5
-5/2*x = 17/5 // : -5/2
x = 17/5/(-5/2)
x = -34/25
x = -34/25
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