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(-1/3)*x+2/5 = (-5/3)*x-7 // - (-5/3)*x-7
(-1/3)*x-((-5/3)*x)+2/5+7 = 0
(-1/3)*x+(5/3)*x+2/5+7 = 0
4/3*x+37/5 = 0 // - 37/5
4/3*x = -37/5 // : 4/3
x = -37/5/4/3
x = -111/20
x = -111/20
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