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7*x-8+9 = -2*x-(7/9) // + -2*x-(7/9)
7*x-(-2*x)+7/9-8+9 = 0
7*x+2*x+7/9-8+9 = 0
9*x+16/9 = 0 // - 16/9
9*x = -16/9 // : 9
x = -16/9/9
x = -16/81
x = -16/81
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