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2x-3(7x+3)=105
We move all terms to the left:
2x-3(7x+3)-(105)=0
We multiply parentheses
2x-21x-9-105=0
We add all the numbers together, and all the variables
-19x-114=0
We move all terms containing x to the left, all other terms to the right
-19x=114
x=114/-19
x=-6
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