-7r+20=2r-4(1+3r)

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Solution for -7r+20=2r-4(1+3r) equation:



-7r+20=2r-4(1+3r)
We move all terms to the left:
-7r+20-(2r-4(1+3r))=0
We add all the numbers together, and all the variables
-7r-(2r-4(3r+1))+20=0
We calculate terms in parentheses: -(2r-4(3r+1)), so:
2r-4(3r+1)
We multiply parentheses
2r-12r-4
We add all the numbers together, and all the variables
-10r-4
Back to the equation:
-(-10r-4)
We get rid of parentheses
-7r+10r+4+20=0
We add all the numbers together, and all the variables
3r+24=0
We move all terms containing r to the left, all other terms to the right
3r=-24
r=-24/3
r=-8

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