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(1/4)*(4*x-16) = 0.25*(20-(12*x))-1 // - 0.25*(20-(12*x))-1
(1/4)*(4*x-16)-(0.25*(20-(12*x)))+1 = 0
(1/4)*(4*x-16)-0.25*(20-12*x)+1 = 0
1/4*(4*x-16)-0.25*(20-12*x)+1 = 0
1/4*(4*x-16)-0.25*(20-12*x)+1 = 0
4*x-9+1 = 0
4*x-8 = 0
4*x-8 = 0
4*x-8 = 0 // + 8
4*x = 8 // : 4
x = 8/4
x = 2
x = 2
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