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4x=4.9x+9
We move all terms to the left:
4x-(4.9x+9)=0
We get rid of parentheses
4x-4.9x-9=0
We add all the numbers together, and all the variables
-0.9x-9=0
We move all terms containing x to the left, all other terms to the right
-0.9x=9
x=9/-0.9
x=-10
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