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4*(-(2*x)-9) = -100 // + 100
4*(-(2*x)-9)+100 = 0
4*(-2*x-9)+100 = 0
4*(-2*x-9)+100 = 0
64-8*x = 0
64-8*x = 0
64-8*x = 0 // - 64
-8*x = -64 // : -8
x = -64/(-8)
x = 8
x = 8
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