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1+4.5x+4.9x=-8.4
We move all terms to the left:
1+4.5x+4.9x-(-8.4)=0
We add all the numbers together, and all the variables
9.4x+9.4=0
We move all terms containing x to the left, all other terms to the right
9.4x=-9.4
x=-9.4/9.4
x=-1
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