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2+9r=7(10-6r)
We move all terms to the left:
2+9r-(7(10-6r))=0
We add all the numbers together, and all the variables
9r-(7(-6r+10))+2=0
We calculate terms in parentheses: -(7(-6r+10)), so:We get rid of parentheses
7(-6r+10)
We multiply parentheses
-42r+70
Back to the equation:
-(-42r+70)
9r+42r-70+2=0
We add all the numbers together, and all the variables
51r-68=0
We move all terms containing r to the left, all other terms to the right
51r=68
r=68/51
r=1+1/3
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