Subtract the following by using column method:
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In these type of questions involving algebraic add/subtraction write/identify the terms having same degree in same variable then add their coefficients (numbers multiplied with them) if we have to add. If we have to subtract a from b then write b firstly then change the sign,reverse the sign of terms(multiply the signs of algebraic terms by -1) and then follow the addition process. This would give the result.
1. 2b+4a-6-(7+9a-7b)= -13+9b-5a
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In column method write the second algebraic expression down the first ,method is same.
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