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(2/2)*x+3 = (-1/3)*x-4 // - (-1/3)*x-4
(2/2)*x-((-1/3)*x)+3+4 = 0
(2/2)*x+(1/3)*x+3+4 = 0
4/3*x+7 = 0 // - 7
4/3*x = -7 // : 4/3
x = -7/4/3
x = -21/4
x = -21/4
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