Answer:
x = 75
Step-by-step explanation:
Corresponding angles on the same side of the transversal are equal
10x + 5 = 12x - 9 Add 9 to both sides
10x + 5 + 9 = 12x Combine
10x + 14 = 12x Subtract 10x from both sides
14 = 12x - 10x Combine
14 = 2x Divide by 2
2x = 14
x = 14/2
x = 7
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10x + 5 = 10*7 + 5
10x + 5 = 75
12x - 9 = 12*7 - 9
12x - 9 = 84 - 9
12x - 9 = 75
