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2.3x+1.9x=-8.4
We move all terms to the left:
2.3x+1.9x-(-8.4)=0
We add all the numbers together, and all the variables
4.2x+8.4=0
We move all terms containing x to the left, all other terms to the right
4.2x=-8.4
x=-8.4/4.2
x=-2
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