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4.21x+49=17.7241+7x
We move all terms to the left:
4.21x+49-(17.7241+7x)=0
We add all the numbers together, and all the variables
4.21x-(7x+17.7241)+49=0
We get rid of parentheses
4.21x-7x-17.7241+49=0
We add all the numbers together, and all the variables
-2.79x+31.2759=0
We move all terms containing x to the left, all other terms to the right
-2.79x=-31.2759
x=-31.2759/-2.79
x=11+0.5859/2.79
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