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(-3/7)*(2*x+2/3) = -15/14 // + -15/14
(-3/7)*(2*x+2/3)-(-15/14) = 0
(-3/7)*(2*x+2/3)+15/14 = 0
15/14-3/7*(2*x+2/3) = 0
(-3/7*14*(2*x+2/3))/14+15/14 = 0
15-3/7*14*(2*x+2/3) = 0
11-12*x = 0
(11-12*x)/14 = 0
(11-12*x)/14 = 0 // * 14
11-12*x = 0
11-12*x = 0 // - 11
-12*x = -11 // : -12
x = -11/(-12)
x = 11/12
x = 11/12
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