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a*9-10a*3=-21
We move all terms to the left:
a*9-10a*3-(-21)=0
We add all the numbers together, and all the variables
a*9-10a*3+21=0
Wy multiply elements
9a-30a+21=0
We add all the numbers together, and all the variables
-21a+21=0
We move all terms containing a to the left, all other terms to the right
-21a=-21
a=-21/-21
a=1
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