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2x-4x+7=5x-21
We move all terms to the left:
2x-4x+7-(5x-21)=0
We add all the numbers together, and all the variables
-2x-(5x-21)+7=0
We get rid of parentheses
-2x-5x+21+7=0
We add all the numbers together, and all the variables
-7x+28=0
We move all terms containing x to the left, all other terms to the right
-7x=-28
x=-28/-7
x=+4
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