Alguém me ajuda com esses ângulos ?

1) x - 100 + x + 10 = 180
2x = 180 - 100 - 10
2x = 70 -> x= 35

2) 5x +30 +x = 180
6x = 180 - 30
6x = 150 -> x = 25

3) x + 45 + x - 45 = 180

2x = 180 - 45 +45 
2x = 180 -> x = 90

4) 3x + 30 +5x - 90 = 180
8x = 180 - 30 + 90
8x = 240 -> x = 30

a)

\[\eqalign{ & x - 100 + x + 10 = 180 \cr & 2x - 90 = 180 \cr & 2x = 270 \cr & x = \dfrac{{270}}{2} \cr & x = 135 }\]

b)

\[\eqalign{ & x + 5x + 30 = 180 \cr & 6x = 180 - 30 \cr & 6x = 150 \cr & x = \dfrac{{150}}{6} \cr & x = 25 }\]

c)

\[\eqalign{ & x + 45 + x - 45 = 180 \cr & 2x = 180 \cr & x = \dfrac{{180}}{2} \cr & x = 90 }\]

d)

\[\eqalign{ & 3x + 30 + 5x - 90 = 180 \cr & 8x - 60 = 180 \cr & 8x = 180 + 60 \cr & 8x = 240 \cr & x = 30 }\]