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5a-151=-2a+45
We move all terms to the left:
5a-151-(-2a+45)=0
We get rid of parentheses
5a+2a-45-151=0
We add all the numbers together, and all the variables
7a-196=0
We move all terms containing a to the left, all other terms to the right
7a=196
a=196/7
a=28
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