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(-1/3)*x+13/3 = -2*x-4 // + -2*x-4
(-1/3)*x-(-2*x)+13/3+4 = 0
(-1/3)*x+2*x+13/3+4 = 0
5/3*x+25/3 = 0 // - 25/3
5/3*x = -25/3 // : 5/3
x = -25/3/5/3
x = -5
x = -5
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