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