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2.1(x-3)=3.6x+4.2
We move all terms to the left:
2.1(x-3)-(3.6x+4.2)=0
We multiply parentheses
2.1x-(3.6x+4.2)-6.3=0
We get rid of parentheses
2.1x-3.6x-4.2-6.3=0
We add all the numbers together, and all the variables
-1.5x-10.5=0
We move all terms containing x to the left, all other terms to the right
-1.5x=10.5
x=10.5/-1.5
x=-7
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