Solve for x
x\leq 0
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3x+9x\leq 0
Add 9x to both sides.
12x\leq 0
Combine 3x and 9x to get 12x.
x\leq 0
Product of two numbers is ≤0 if one is ≥0 and the other is ≤0. Since 12\geq 0, x must be ≤0.
Examples
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Linear equation
y = 3x + 4
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Matrix
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Simultaneous equation
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Differentiation
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Limits
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