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-0.5x+1.68=-0.9x+8.48
We move all terms to the left:
-0.5x+1.68-(-0.9x+8.48)=0
We get rid of parentheses
-0.5x+0.9x-8.48+1.68=0
We add all the numbers together, and all the variables
0.4x-6.8=0
We move all terms containing x to the left, all other terms to the right
0.4x=6.8
x=6.8/0.4
x=17+-8.8817841970013E-16/0.4
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