You want to isolate the variable x, so subtract 9 from both sides
5x = -26 - 9 = -35
Divide by 5 on both sides
x = -35/5 = -7
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5x+18 = 2x+9 5x-2x = 9-18 3x = -9 x = -3 and y = 3
If: x+9+5x = 21+2x Then: x = 3
39 = 5x + 9 5x = 39 - 9 5x = 30 x = 30 / 5 x = 6
x=7
5x + x - 6x + 2x = 2x