nomer 2 dan 5 gimana ya ini?

2. [tex] \frac{27}{36} = \frac{x}{x+3} [/tex]
⇔[tex] \frac{3}{4} = \frac{x}{x+3} [/tex]  ⇒disederhanakan
⇔4x = 3(x+3)
⇔4x = 3x + 9
⇔x = 9

5. 3x + (7x+80°) = 180°
⇔10x = 100°
⇔x = 10°