If the three angles of a triangle are [ 2x ₊ 15 ] ° , 85° and [ x ₊ 20 ]° , find the value of x.
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since sum of all angles are is 180°
2x + 15 + 85+ x+20= 180
3x + 120= 180
3x=180-120
3x= 60
x =60÷3
x= 20°
2x + 15 + 85+ x+20= 180
3x + 120= 180
3x=180-120
3x= 60
x =60÷3
x= 20°
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