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6x+3(1+4x)=-141
We move all terms to the left:
6x+3(1+4x)-(-141)=0
We add all the numbers together, and all the variables
6x+3(4x+1)-(-141)=0
We add all the numbers together, and all the variables
6x+3(4x+1)+141=0
We multiply parentheses
6x+12x+3+141=0
We add all the numbers together, and all the variables
18x+144=0
We move all terms containing x to the left, all other terms to the right
18x=-144
x=-144/18
x=-8
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