exam Maths Puzzle Numerical Ability

Solve. X/8 = -1

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exam Other Question

9/4a=13

or 9 = 13 * 4a

or 9 = 52a

or 9 / 52 = a

2/7=x/3

or (2 /7) * 3 = x

or 6/7 = x

7x/8-1/4+3x/4=1/16+x Question:
Find the domain and range of:
{(7,-2),(-6,-4),(-9,-9),(-5,-5),(6,6)}