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(2k+3)+(4k-3)=90
We move all terms to the left:
(2k+3)+(4k-3)-(90)=0
We get rid of parentheses
2k+4k+3-3-90=0
We add all the numbers together, and all the variables
6k-90=0
We move all terms containing k to the left, all other terms to the right
6k=90
k=90/6
k=15
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