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(2/3)*(9*a-12) = -6*a-11 // + -6*a-11
(2/3)*(9*a-12)-(-6*a)+11 = 0
(2/3)*(9*a-12)+6*a+11 = 0
2/3*(9*a-12)+6*a+11 = 0
2/3*(9*a-12)+6*a+11 = 0
12*a-8+11 = 0
12*a+3 = 0
12*a+3 = 0
12*a+3 = 0 // - 3
12*a = -3 // : 12
a = -3/12
a = -1/4
a = -1/4
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