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5.2=2.3(r+2)-4
We move all terms to the left:
5.2-(2.3(r+2)-4)=0
We calculate terms in parentheses: -(2.3(r+2)-4), so:We get rid of parentheses
2.3(r+2)-4
We multiply parentheses
2.3r+4.6-4
We add all the numbers together, and all the variables
2.3r+0.6
Back to the equation:
-(2.3r+0.6)
-2.3r-0.6+5.2=0
We add all the numbers together, and all the variables
-2.3r+4.6=0
We move all terms containing r to the left, all other terms to the right
-2.3r=-4.6
r=-4.6/-2.3
r=+2
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