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hello
first the equation was 6 + a - 2b = 3
subtract (6-2b) from both sides.so, 6+ a - 2b - (6-2b)= 3 - (6-2b)
6 + a - 2b - 6 +2b = 3 -6 +2b
6 - 6 + a -2b +2b = 3 - 6 +2b
0 + a + 0 = -3 + 2b
a = -3 + 2b
a = 2b - 3........................answer
this is how you get , a = 2b -3
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