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2.4+5.1x=4.2x-6.6
We move all terms to the left:
2.4+5.1x-(4.2x-6.6)=0
We get rid of parentheses
5.1x-4.2x+6.6+2.4=0
We add all the numbers together, and all the variables
0.9x+9=0
We move all terms containing x to the left, all other terms to the right
0.9x=-9
x=-9/0.9
x=-10
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