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2.4x-5.8+4.9x-5+7.1x=0
We add all the numbers together, and all the variables
14.4x-10.8=0
We move all terms containing x to the left, all other terms to the right
14.4x=10.8
x=10.8/14.4
x=3.85714285714/5.14285714286
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