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6.9x+12.4=-4.1x-5.3
We move all terms to the left:
6.9x+12.4-(-4.1x-5.3)=0
We get rid of parentheses
6.9x+4.1x+5.3+12.4=0
We add all the numbers together, and all the variables
11x+17.7=0
We move all terms containing x to the left, all other terms to the right
11x=-17.7
x=-17.7/11
x=-1+3.9411764705882/6.4705882352941
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