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Respuesta:
a. x = 45
b. x = 17,2
Explicación paso a paso:
a.
x - 2 + x - 3 + 2x + 5 = 180
x + x + 2x - 2 - 3 + 5 = 180
4x - 5 + 5 = 180
4x + 0 = 180
4x = 180
x = 180 / 4
x = 45
b.
7x + 1 + 7x + 1 + 3x + 7 + 3x + 7 = 360
7x + 3x + 7x + 3x + 7 + 7 + 1 + 1 = 360
10x + 10x + 14 + 2 = 360
20x + 16 = 360
20x = 360 - 16
20x = 344
x = 344 / 20
= 86 / 5
x = 17,2