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Compound Inequality Calculator

Solve a three-part compound inequality like a < bx + c ≤ d for x — with the solution in interval notation and a number-line graph.

Solve  a ≶ bx + c ≶ d
lower sign b x + c sign upper

Solve a compound inequality like −1 < 2x + 3 ≤ 11. Both parts are solved together for x.

Results

Solution (interval notation)
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Inequality form
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Lower bound on x
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Upper bound on x
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Number line

Step-by-step