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x-4+x\leq 0
Add x to both sides.
2x-4\leq 0
Combine x and x to get 2x.
2x\leq 4
Add 4 to both sides. Anything plus zero gives itself.
x\leq \frac{4}{2}
Divide both sides by 2. Since 2 is positive, the inequality direction remains the same.
x\leq 2
Divide 4 by 2 to get 2.