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Step-by-step explanation:
9 ) x + 11 / 7 = 9
X = 7 * 9 -11
X = 63 - 11
= 52
6) 1/3x - 1/5x = 6
LCM = 15
= 5/15x -3/15x =6
2/15x =6
2x = 90
x= 90/2
= 45
7). Side 1 = 6cm
Side 2 = 2x
Side 3 = x
Perimeter = 18cm
6 + 2x + x = 18 cm
6 +3x = 18 cm
3x = 18 cm - 6 cm
3 x = 12 cm
x= 12/ 3
= 4 cm
Side 2. = 2 x = 8 cm
Side 3. = x =. 4 cm
Side 1. = 6 cm
HOpe It helps
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