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4.2x+3.4x=19
We move all terms to the left:
4.2x+3.4x-(19)=0
We add all the numbers together, and all the variables
7.6x-19=0
We move all terms containing x to the left, all other terms to the right
7.6x=19
x=19/7.6
x=2+2.1111111111111/4.2222222222222
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