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you mean: x+3x+3=x+18 so x=5
The given expression can be simplified to: 3X squared +27
-3x+7=2x-18 ---> 7+18=2x-3x ----> 25=5x ----> x=5
3x + 5 = 6x + 23 -3x = 18 x = -6
-3x + (-18) = 2x + 7 +18 +18 -3x = 2x +25 -2x -2x -5x = 25 ----- ----- -5 -5 x=-5 *------- equals a division line