Solve for x
x\leq 0
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16x-x\leq 0
Subtract x from both sides.
15x\leq 0
Combine 16x and -x to get 15x.
x\leq 0
Product of two numbers is ≤0 if one is ≥0 and the other is ≤0. Since 15\geq 0, x must be ≤0.
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