How do get 423 from the numbers 100, 50, 75, 3, 10 & 7?
2 answers:
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You have to move all terms involving the variable on one side, and all constant terms on the other side.
To move a term from a side to the other, you have to change its side.
So, for example, if you move 4x from left to right, it will become -4x (you're actually subtracting 4x from both sides):
Similarly, add 5 to both side to get
Finally, divide both sides by 3: