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