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6-((2/3)*(6*x-9)) = -5*x-21 // + -5*x-21
6-((2/3)*(6*x-9))-(-5*x)+21 = 0
(-2/3)*(6*x-9)+5*x+6+21 = 0
5*x-2/3*(6*x-9)+6+21 = 0
5*x-2/3*(6*x-9)+6+21 = 0
x+6+6+21 = 0
x+12+21 = 0
x+33 = 0
x+33 = 0
x+33 = 0 // - 33
x = -33
x = -33
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