Answer:
7.) 20 8.) -117 / 11
Step-by-step explanation:
7.) 4/5 * 20 - 1/4x * 20 = 11 *20
16x - 5x = 220
11x =220
x = 20
8.) - 0.55x - 0.45 = 5.4
-0.55x * 100 * 0.45 * 100 = 5.4 * 100
-55x - 45 = 540
-55x / -55 = 585 / -55
x = 117 / 11
