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10(6+a)=250
We move all terms to the left:
10(6+a)-(250)=0
We add all the numbers together, and all the variables
10(a+6)-250=0
We multiply parentheses
10a+60-250=0
We add all the numbers together, and all the variables
10a-190=0
We move all terms containing a to the left, all other terms to the right
10a=190
a=190/10
a=19
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