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13-((7*x)/36) = 20 // - 20
13-((7*x)/36)-20 = 0
(-7/36)*x-20+13 = 0
-7/36*x-7 = 0 // + 7
-7/36*x = 7 // : -7/36
x = 7/(-7/36)
x = -36
x = -36
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