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XX4=-12+3
We move all terms to the left:
XX4-(-12+3)=0
We add all the numbers together, and all the variables
XX4-(-9)=0
We add all the numbers together, and all the variables
XX4+9=0
We move all terms containing X to the left, all other terms to the right
XX4=-9
X=-9/1
X=-9
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