That would depend on the status of 18 which is not quite clear
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-3x + (-18) = 2x + 7 +18 +18 -3x = 2x +25 -2x -2x -5x = 25 ----- ----- -5 -5 x=-5 *------- equals a division line
-3x+7=2x-18 ---> 7+18=2x-3x ----> 25=5x ----> x=5
2x + 3x = 5x
5x+18 = 2x+9 5x-2x = 9-18 3x = -9 x = -3 and y = 3
3x+56 = 2x+4 3x-2x = 4-56 x = -52