mohon dibantu utk soal no. 10 dan 11

10. 5x=90
        x=15 b=2x=2x18=36
11.
360-90=270
270/15=18(b)

10. (2/5) x 180 = 72

11.
[tex]7x + 8x + 90 = 360 \\ 15x + 90 = 360 \\ 15x = 360 - 90 \\ 15x = 270 \\ x = 18[/tex]