Question

alguem me helpaaaaaaa

Answer 1

A: 2x+x=90
3x=90
x=90/3 = 30

B- 5x +10 +4x-10=180
9x+10-10=180
9x+0 =180
9×=180
x=180/9=20

C- X-5+2x+5=90
3x+0=90
3×=90
x=90/3=30

Grato