Explanation:
x=3
first add 2+ 1
then add x+3x
subtract 3 from both sides
4x+3(-3)=15(-3)
divide by 4 on both sides
4x/4=12/4
Add up the numbers.
Combine like terms.
Subtract 3 from both sides.
Simplify
Divide both sides by the same factor.
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