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(2/3)*(6*x+3) = 2*(-3*x-9) // - 2*(-3*x-9)
(2/3)*(6*x+3)-(2*(-3*x-9)) = 0
(2/3)*(6*x+3)-2*(-3*x-9) = 0
2/3*(6*x+3)-2*(-3*x-9) = 0
2/3*(6*x+3)-2*(-3*x-9) = 0
10*x+20 = 0
10*x+20 = 0
10*x+20 = 0 // - 20
10*x = -20 // : 10
x = -20/10
x = -2
x = -2
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