exam Maths Puzzle Numerical Ability

Three less than the square of a number can be written as

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exam Other Question

Can anyone help me with this equation? I would greatly appreciate your help.
R
__ - 6 = -R



and

x + 1x = 16
___
7

College Mathematics seventh edition pa
Solve each equation:

1. 3x + 5 - 6x = 3 - x
2. 3 - (1/5)(x) = 2
3. x - .2x = 6.4