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1*x+6 = 2/3-7*x // - 2/3-7*x
1*x-(-7*x)-(2/3)+6 = 0
x+7*x-2/3+6 = 0
8*x+16/3 = 0 // - 16/3
8*x = -16/3 // : 8
x = -16/3/8
x = -2/3
x = -2/3
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