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2a + 6 = 12
2a = 6
a = 3
b.>>>
10r - 15 = 5
10r = 20
r = 2
c.>>>
3p + 18 = 2p - 6
p = - 24
d.>>>
12 - 6x = 12
- 6x = 0
x = 0
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