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21q=28/8
We move all terms to the left:
21q-(28/8)=0
We add all the numbers together, and all the variables
21q-(+28/8)=0
We get rid of parentheses
21q-28/8=0
We multiply all the terms by the denominator
21q*8-28=0
Wy multiply elements
168q-28=0
We move all terms containing q to the left, all other terms to the right
168q=28
q=28/168
q=1/6
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