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1x+3(2x)+4(2x+3)=87
We move all terms to the left:
1x+3(2x)+4(2x+3)-(87)=0
We add all the numbers together, and all the variables
33x+4(2x+3)-87=0
We multiply parentheses
33x+8x+12-87=0
We add all the numbers together, and all the variables
41x-75=0
We move all terms containing x to the left, all other terms to the right
41x=75
x=75/41
x=1+34/41
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