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12*(6-((1/2)*x)) = 240 // - 240
12*(6-((1/2)*x))-240 = 0
12*((-1/2)*x+6)-240 = 0
12*(6-1/2*x)-240 = 0
12*(6-1/2*x)-240 = 0
-6*x-168 = 0
-6*x-168 = 0
-6*x-168 = 0 // + 168
-6*x = 168 // : -6
x = 168/(-6)
x = -28
x = -28
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