4(a+5)-2(2a+1)=18

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Solution for 4(a+5)-2(2a+1)=18 equation: 



4(a+5)-2(2a+1)=18

We move all terms to the left:

4(a+5)-2(2a+1)-(18)=0

We multiply parentheses

4a-4a+20-2-18=0

We add all the numbers together, and all the variables

=0

a=0/1

a=0

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