15
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9
9. -6+6=0 0+3=3 therefore -6+9=3
x-6=9 With this problem you have to isolate (Leave it by itself) X. In order to do this, You need to take away the -6, correct? to get rid of the -6, you have to add 6 to the left side. In algebra you always need to know, whatever you do to one side, you need to do to the other. So, then you add 6 to the 9. Then, you're left with x=15. Wa, La! In simpler terms, x-6=9 +6, +6 x=15
you need to add +9 +9-7 = +2
You need to add 12.