5x+18 = 2x+9
5x-2x = 9-18
3x = -9
x = -3 and y = 3
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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
5x + x - 6x + 2x = 2x
-3x+7=2x-18 ---> 7+18=2x-3x ----> 25=5x ----> x=5
-5x+3(x+8)=16-2x
If: x+9+5x = 21+2x Then: x = 3