1)a + b = 28
2)2b - 5 = a
a + b = 28
2b -5 + b= 28
3b - 5 =28
3b =28 + 5
3b = 33
b = 11
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1)a + b = 28
2)2b - 5 = a
a + b = 28
2b -5 + b= 28
3b - 5 =28
3b =28 + 5
3b = 33
b = 11