Question

$when 2a + b + 3 \: is \: added \: to \: a - 2b - 4 \: we \: get \: \: \:$
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Answer 1

so,

(2a+b+3)+(a-2b-4)

=(2a+a)+(2a-2b)+(2a-4)+(b+a)+(b-2b)+(b-4)+(3+a)+(3-2b)+(3-4)

=(3a)+(2a-2b)+(2a-4)+