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4x+5+x+9+5x-3=50
We move all terms to the left:
4x+5+x+9+5x-3-(50)=0
We add all the numbers together, and all the variables
10x-39=0
We move all terms containing x to the left, all other terms to the right
10x=39
x=39/10
x=3+9/10
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