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(-4/3)*x+(36/21)*x = 4/21 // - 4/21
(-4/3)*x+(36/21)*x-(4/21) = 0
(-4/3)*x+(36/21)*x-4/21 = 0
8/21*x-4/21 = 0 // + 4/21
8/21*x = 4/21 // : 8/21
x = 4/21/8/21
x = 1/2
x = 1/2
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