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3x-7x=2.4-(-10)
We move all terms to the left:
3x-7x-(2.4-(-10))=0
We add all the numbers together, and all the variables
-4x-12.4=0
We move all terms containing x to the left, all other terms to the right
-4x=12.4
x=12.4/-4
x=-3+0.4/4
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