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3x+3(-6x-21)=183
We move all terms to the left:
3x+3(-6x-21)-(183)=0
We multiply parentheses
3x-18x-63-183=0
We add all the numbers together, and all the variables
-15x-246=0
We move all terms containing x to the left, all other terms to the right
-15x=246
x=246/-15
x=-16+2/5
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