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5*8+3*12=(5+3)*x
We move all terms to the left:
5*8+3*12-((5+3)*x)=0
We add all the numbers together, and all the variables
-(8*x)+5*8+3*12=0
We add all the numbers together, and all the variables
-(8*x)+76=0
We get rid of parentheses
-8*x+76=0
We add all the numbers together, and all the variables
-8x+76=0
We move all terms containing x to the left, all other terms to the right
-8x=-76
x=-76/-8
x=9+1/2
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