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3x+4(2x+3)=40
We move all terms to the left:
3x+4(2x+3)-(40)=0
We multiply parentheses
3x+8x+12-40=0
We add all the numbers together, and all the variables
11x-28=0
We move all terms containing x to the left, all other terms to the right
11x=28
x=28/11
x=2+6/11
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