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7=3-4*7a
We move all terms to the left:
7-(3-4*7a)=0
We add all the numbers together, and all the variables
-(-4*7a+3)+7=0
We get rid of parentheses
4*7a-3+7=0
We add all the numbers together, and all the variables
4*7a+4=0
Wy multiply elements
28a+4=0
We move all terms containing a to the left, all other terms to the right
28a=-4
a=-4/28
a=-1/7
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