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3x+2(18-4x)=21
We move all terms to the left:
3x+2(18-4x)-(21)=0
We add all the numbers together, and all the variables
3x+2(-4x+18)-21=0
We multiply parentheses
3x-8x+36-21=0
We add all the numbers together, and all the variables
-5x+15=0
We move all terms containing x to the left, all other terms to the right
-5x=-15
x=-15/-5
x=+3
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