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(1/4)*x-(12*x) = -13 // + 13
(1/4)*x-(12*x)+13 = 0
(1/4)*x-12*x+13 = 0
13-47/4*x = 0 // - 13
-47/4*x = -13 // : -47/4
x = -13/(-47/4)
x = 52/47
x = 52/47
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