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(2/3)*(6*x+9) = (3/4)*(8*x+4)-3 // - (3/4)*(8*x+4)-3
(2/3)*(6*x+9)-((3/4)*(8*x+4))+3 = 0
(2/3)*(6*x+9)+(-3/4)*(8*x+4)+3 = 0
2/3*(6*x+9)-3/4*(8*x+4)+3 = 0
2/3*(6*x+9)-3/4*(8*x+4)+3 = 0
3-2*x+3 = 0
6-2*x = 0
6-2*x = 0
6-2*x = 0 // - 6
-2*x = -6 // : -2
x = -6/(-2)
x = 3
x = 3
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