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mafiozo [28]
3 years ago
5

2(4 - 2r) = -2(r + 5)

Mathematics
2 answers:
Alexus [3.1K]3 years ago
5 0
2(4 - 2r) = -2(r + 5)

First, divide both sides by -2. / Your problem should look like: -4 + 2r = r + 5
Second, regroup your terms. / Your problem should look like: 2r - 4 = r + 5
Third, add 4 to both sides. / Your problem should look like: 2r = r + 5  + 4
Fourth, add r + 5 + 4 to get r + 9. / Your problem should look like:2r = r + 9
Fifth, subtract r from both sides. / Your problem should look like: 2r - r = 9
Sixth, subtract 2r - r to get r. / Your problem should look like: r = 9

Answer: r = 9

weqwewe [10]3 years ago
5 0
8-4r = -2r-10
2r-4r=-10-8
-2r = -18
<span>r = 9</span>
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The answer is 
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r1                r2               r3           r4          r5               .  .  .                  r31
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</span><span> the weights of those 5 rings was 80 gms</span>
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