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12(2x+4)=30x
We move all terms to the left:
12(2x+4)-(30x)=0
We add all the numbers together, and all the variables
-30x+12(2x+4)=0
We multiply parentheses
-30x+24x+48=0
We add all the numbers together, and all the variables
-6x+48=0
We move all terms containing x to the left, all other terms to the right
-6x=-48
x=-48/-6
x=+8
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