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7x - 3 - 2x = 17
-2 -2
7x - 3 - x = 15
-7 -7
x - 3 - x = 8
+3 +3
x - x = 11
+x +x
x=11x
-x -x
(x=) 11
does that look familiar from class? You can do it different ways...
* * * * *
Yes, you can do it the correct way, instead!
7x - 3 - 2x = 17
Combine the like terms (7x and -2x) on the left side: 5x - 3 = 17
Add 3 to both sides: 5x = 20
Divide both sides by 5: x = 4
Check:
7*4 - 3 - 2*4 = 28 - 3 - 8 = 28 - 11 = 17
Does not work with x = 11!
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