Answer: x = 11
To find the value of x we know that the sum of total interior triangle is 180.
90 + (5x - 2) + (3x + 4) = 180
Remove parenthesis
90 + 5x - 2 + 3x + 4 = 180
Group like terms
5x + 3x + 90 - 2 + 4 = 180
Add similar elements
8x + 92 - 92 = 180 - 92
Add/subtract the numbers: 90 - 2 + 4 = 92
8x + 92 = 180
Subtract 92 from both sides
8x + 92 - 92 = 180 - 92
Simplify
8x = 88
Divide birth sides by 8
8x/8 = 88/8
Simplify
X = 11
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