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(5a+8) - (2a+4) =3a +4 To do this, simply subtract like terms. 5a-2a=3a and 8-4=4
If We are looking for A, B and C If the first number is A then we know B = A+2 C = A+4 and 3A = B+C or 3A = (A+2) + (A+4) so 3A = 2A +6 3A - 2A = 6 A = 6 B= 8 C= 10
a + a + a - 2a = 3a - 2a = a
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