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3(1+x/7)=150
We move all terms to the left:
3(1+x/7)-(150)=0
We add all the numbers together, and all the variables
3(x/7+1)-150=0
We multiply parentheses
3x+3-150=0
We add all the numbers together, and all the variables
3x-147=0
We move all terms containing x to the left, all other terms to the right
3x=147
x=147/3
x=49
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