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3.5x+-2.7x=-6
We move all terms to the left:
3.5x+-2.7x-(-6)=0
We add all the numbers together, and all the variables
0.8x+6=0
We move all terms containing x to the left, all other terms to the right
0.8x=-6
x=-6/0.8
x=-7+0.4/0.8
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