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6.4x+5.4x+3.6=1.2
We move all terms to the left:
6.4x+5.4x+3.6-(1.2)=0
We add all the numbers together, and all the variables
11.8x+2.4=0
We move all terms containing x to the left, all other terms to the right
11.8x=-2.4
x=-2.4/11.8
x=-2.4/11.8
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