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-5.4x-7.8x=-78.408
We move all terms to the left:
-5.4x-7.8x-(-78.408)=0
We add all the numbers together, and all the variables
-13.2x+78.408=0
We move all terms containing x to the left, all other terms to the right
-13.2x=-78.408
x=-78.408/-13.2
x=5+8.8125/9.375
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