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22.05=7.8x+8.9x
We move all terms to the left:
22.05-(7.8x+8.9x)=0
We add all the numbers together, and all the variables
-(+16.7x)+22.05=0
We get rid of parentheses
-16.7x+22.05=0
We move all terms containing x to the left, all other terms to the right
-16.7x=-22.05
x=-22.05/-16.7
x=1+3.96296296296/12.3703703704
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