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4=21+(x2.5)
We move all terms to the left:
4-(21+(x2.5))=0
We add all the numbers together, and all the variables
-(21+(+x2.5))+4=0
We calculate terms in parentheses: -(21+(+x2.5)), so:We get rid of parentheses
21+(+x2.5)
determiningTheFunctionDomain (+x2.5)+21
We get rid of parentheses
x2.5+21
Back to the equation:
-(x2.5+21)
-x2.5-21+4=0
We add all the numbers together, and all the variables
-x2.5-17=0
We move all terms containing x to the left, all other terms to the right
-x2.5=17
x=17/1
x=17
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