- 6r - 5 = 7 - 12r
add 12r to both sides
12r - 6r - 5 = 7 - 12r + 12r
6r - 5 = 7
add 5 to both sides
6r - 5 + 5 = 7 + 5
6r = 12
divide both side integers by 6
r = 2
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check in original equation
-6(2) - 5 = 7 - 12(2)
- 12 - 5 = 7 - 24
- 17 = - 17
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if you have 12r and you minus 4r it doesn't equal 48. it would equal 8r to find out what r is i would have to see the whole problem
-1r
12r-20
12r + 4 = 112, 12r = 108, r = 9
r - 12 ≥ 5r - 12 + 12 ≥ 5 + 12r ≥ 17