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2(x)+3(x+1)+4(x+2)=74
We move all terms to the left:
2(x)+3(x+1)+4(x+2)-(74)=0
We multiply parentheses
2x+3x+4x+3+8-74=0
We add all the numbers together, and all the variables
9x-63=0
We move all terms containing x to the left, all other terms to the right
9x=63
x=63/9
x=7
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