18 = 3x
6 = x
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If x-3x=18 then x equals -9
3x=18 x=18/3 x=6
18=3(3x-6)
-3x+7=2x-18 ---> 7+18=2x-3x ----> 25=5x ----> x=5
-3x + (-18) = 2x + 7 +18 +18 -3x = 2x +25 -2x -2x -5x = 25 ----- ----- -5 -5 x=-5 *------- equals a division line