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10=0.1(4+16a)
We move all terms to the left:
10-(0.1(4+16a))=0
We add all the numbers together, and all the variables
-(0.1(16a+4))+10=0
We calculate terms in parentheses: -(0.1(16a+4)), so:We get rid of parentheses
0.1(16a+4)
We multiply parentheses
1.6a+0.4
Back to the equation:
-(1.6a+0.4)
-1.6a-0.4+10=0
We add all the numbers together, and all the variables
-1.6a+9.6=0
We move all terms containing a to the left, all other terms to the right
-1.6a=-9.6
a=-9.6/-1.6
a=5+1/1
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