Find the solution set of 8x< 7x+9

For this case we must resolve the following inequality:

Subtracting from both sides of the inequality we have:

Different signs are subtracted and the major sign is placed.

Thus, the solution is given by all values of x less than 9.

(-∞, 9)

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step-by-step explanation:

m∠a is 90°

m∠b is 40°