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-5(2+7a)+11=18
We move all terms to the left:
-5(2+7a)+11-(18)=0
We add all the numbers together, and all the variables
-5(7a+2)+11-18=0
We add all the numbers together, and all the variables
-5(7a+2)-7=0
We multiply parentheses
-35a-10-7=0
We add all the numbers together, and all the variables
-35a-17=0
We move all terms containing a to the left, all other terms to the right
-35a=17
a=17/-35
a=-17/35
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