Answer:
x = 29
Step-by-step explanation:
The three angles of a triangle add to 180
x+90+61 = 180
Combine like terms
x+151 = 180
Subtract 151 from each side
x+151-151 = 180-151
1/2x or x/2
You're taking the number you started with and either multiplying it by 1/2 half or dividing it by 2.
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