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5x+4(6x-21)=90
We move all terms to the left:
5x+4(6x-21)-(90)=0
We multiply parentheses
5x+24x-84-90=0
We add all the numbers together, and all the variables
29x-174=0
We move all terms containing x to the left, all other terms to the right
29x=174
x=174/29
x=6
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