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3*(2*x+8) = -x-7/3-5 // + -x-7/3-5
3*(2*x+8)+x-(-7/3)+5 = 0
3*(2*x+8)+x+7/3+5 = 0
(3^2*(2*x+8))/3+(3*x)/3+7/3+(3*5)/3 = 0
3^2*(2*x+8)+3*x+3*5+7 = 0
21*x+7+15+72 = 0
21*x+15+79 = 0
21*x+94 = 0
(21*x+94)/3 = 0
(21*x+94)/3 = 0 // * 3
21*x+94 = 0
21*x+94 = 0 // - 94
21*x = -94 // : 21
x = -94/21
x = -94/21
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