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10(a-5)+15=-15
We move all terms to the left:
10(a-5)+15-(-15)=0
We add all the numbers together, and all the variables
10(a-5)+30=0
We multiply parentheses
10a-50+30=0
We add all the numbers together, and all the variables
10a-20=0
We move all terms containing a to the left, all other terms to the right
10a=20
a=20/10
a=2
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