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-3(1+4x)=-75
We move all terms to the left:
-3(1+4x)-(-75)=0
We add all the numbers together, and all the variables
-3(4x+1)-(-75)=0
We add all the numbers together, and all the variables
-3(4x+1)+75=0
We multiply parentheses
-12x-3+75=0
We add all the numbers together, and all the variables
-12x+72=0
We move all terms containing x to the left, all other terms to the right
-12x=-72
x=-72/-12
x=+6
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