book Maths Puzzle Numerical Ability

how do you solve 3a+7 < 16
how do you solve 16 < 3q+4
how do you solve 20-3s > 7s
how do you solve 3x > -9

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book Other Question

how do you do variables .
Ex.

x=4, y=12 can someone give me an real-world application involving either quadratic, rational, or radical equations.