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-78.408=-5.4-7.8x
We move all terms to the left:
-78.408-(-5.4-7.8x)=0
We add all the numbers together, and all the variables
-(-7.8x-5.4)-78.408=0
We get rid of parentheses
7.8x+5.4-78.408=0
We add all the numbers together, and all the variables
7.8x-73.008=0
We move all terms containing x to the left, all other terms to the right
7.8x=73.008
x=73.008/7.8
x=9+2.808/7.8
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