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3*x-(4*x)+2/5 = -4/15 // + -4/15
3*x-(4*x)+2/5-(-4/15) = 0
3*x-4*x+2/5+4/15 = 0
2/3-x = 0 // - 2/3
-x = -2/3 // * -1
x = 2/3
x = 2/3
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