20 c in a p could be referring to twenty cigarettes in a pack.
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P = p + at 82 = 76 + a*20 6 = a*20 6/20 = a that is a = 3/10 or 0.3 That is the answer.
p = r - c r - c = p r - c - r = p - r -(-c) = -(p) c = -p
If we're talking strictly algebra. 12 equals p of c can be written as: 12= p(c) meaning, 12 is the answer for some function p, when c is the variable.
p+c=r.
p=b+3a+c p-3a-c=b+3a-3a+c-c p-3a-c=b b=p-3a-c