5a - 5 = 7 + 2a ( subtract 2a from both sides)
3a - 5 = 7 (add 5 to both sides)
3a = 12 ( divide both sides by 3)
a = 4
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a = 3a + 4 0 = 2a + 4 2a = -4 a = -2
2a + 2b = 160 But b = a + 40 so 2a + 2(a + 40) = 160 ie 2a + 2a + 80 = 160 or 4a = 80 ie a = 20 Then b = a + 40 gives b = 20 + 40 = 60 Solution: a = 20, b = 60
A equals 20.
2a + 3a + 4 = 5a + 4
2a + 9 = 4a - 19 9 + 19 = 4a - 2a 28 = 2a a = 14