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21+(x.3)=26
We move all terms to the left:
21+(x.3)-(26)=0
We add all the numbers together, and all the variables
(+x.3)+21-26=0
We add all the numbers together, and all the variables
(+x.3)-5=0
We get rid of parentheses
x.3-5=0
We move all terms containing x to the left, all other terms to the right
x.3=5
x=5/1
x=5
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