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1.08(1.25)(9-x)=12
We move all terms to the left:
1.08(1.25)(9-x)-(12)=0
We add all the numbers together, and all the variables
1.08(1.25)(-1x+9)-12=0
We multiply parentheses ..
1.08(-1.25x+11.25)-12=0
We multiply parentheses
-1.08x+12.15-12=0
We add all the numbers together, and all the variables
-1.08x+0.15=0
We move all terms containing x to the left, all other terms to the right
-1.08x=-0.15
x=-0.15/-1.08
x=0.15/1.08
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