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18-((1/3)*x) = -7 // + 7
7-((1/3)*x)+18 = 0
(-1/3)*x+7+18 = 0
25-1/3*x = 0 // - 25
-1/3*x = -25 // : -1/3
x = -25/(-1/3)
x = 75
x = 75
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