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(1/4)*(12*x-4) = -13 // + 13
(1/4)*(12*x-4)+13 = 0
1/4*(12*x-4)+13 = 0
1/4*(12*x-4)+13 = 0
3*x+12 = 0
3*x+12 = 0
3*x+12 = 0 // - 12
3*x = -12 // : 3
x = -12/3
x = -4
x = -4
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