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2*x-((8*(x+x+3+6))/2) = 0
2*x-4*(x+x+3+6) = 0
2*x-4*(2*x+9) = 0
2*x-4*(2*x+9) = 0
-6*x-36 = 0
-6*x-36 = 0
-6*x-36 = 0 // + 36
-6*x = 36 // : -6
x = 36/(-6)
x = -6
x = -6
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