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7-((1/5)*x) = 36 // - 36
7-((1/5)*x)-36 = 0
(-1/5)*x-36+7 = 0
-1/5*x-29 = 0 // + 29
-1/5*x = 29 // : -1/5
x = 29/(-1/5)
x = -145
x = -145
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