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