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Mathematics 7 Online
OpenStudy (anonymous):

-10(6r + 3) + 2(4r + 10)

jimthompson5910 (jim_thompson5910):

-10(6r + 3) + 2(4r + 10) -10(6r) -10(3) + 2(4r) + 2(10) -60r -30 + 8r + 20 (-60r+8r) +(-30 + 20) -52r - 10 So -10(6r + 3) + 2(4r + 10) = -52r - 10

OpenStudy (anonymous):

distribute the 10 and the 2 into the parenthesis's

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