Explicación paso a paso:
1)
Hallar "c":
Suma de ángulos internos:
a + b + c = 180
Hallar "x":
7x + 3 + 8x + 5+ 67 = 180
15x = 105
x = 7
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Explicación paso a paso:
1)
Hallar "c":
c = 180 - 113 = 67°
Suma de ángulos internos:
a + b + c = 180
Hallar "x":
7x + 3 + 8x + 5+ 67 = 180
15x = 105
x = 7
a = 7(7) + 3 = 52
b = 8(7) + 5 = 61