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4x+2.4x=50
We move all terms to the left:
4x+2.4x-(50)=0
We add all the numbers together, and all the variables
6.4x-50=0
We move all terms containing x to the left, all other terms to the right
6.4x=50
x=50/6.4
x=7+4.3333333333333/5.3333333333334
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