All angles are of triangle and thus give sum of 180⁰
x + 5 + 7x - 5 + x = 180⁰
9x = 180⁰
x = 20⁰
Answer:
it's 20
Explanation:
(X+5)° + (7x-5)° + x°= 180° { sum of the three angles of the triangle is 180°}
X+5+7x-5+X = 180
X+7x+X+5-5= 180
9x+0 = 180
9x = 180
therefore X= 180/9
= 20
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