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5(-10+a)=-30
We move all terms to the left:
5(-10+a)-(-30)=0
We add all the numbers together, and all the variables
5(a-10)-(-30)=0
We add all the numbers together, and all the variables
5(a-10)+30=0
We multiply parentheses
5a-50+30=0
We add all the numbers together, and all the variables
5a-20=0
We move all terms containing a to the left, all other terms to the right
5a=20
a=20/5
a=4
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