x+(x+2.5)=21

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Solution for x+(x+2.5)=21 equation: 



x+(x+2.5)=21

We move all terms to the left:

x+(x+2.5)-(21)=0

We get rid of parentheses

x+x+2.5-21=0

We add all the numbers together, and all the variables

2x-18.5=0

We move all terms containing x to the left, all other terms to the right

2x=18.5

x=18.5/2

x=9+0.5/2

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