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