exam Maths Puzzle Numerical Ability

sqrt84x divided by sqrt3x in simplist form

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Whats wrong with this?

|m+3| = 12-2m
m+3=12-2m
3=12+2m
3=12-12+2m
3/2=2m/2
m=1.5 or -5

also

I need help with this one.

1/2|6-2x|=3x + 1 Science and medicine. The combined resistance of two resistors R1 and R2 in a
parallel circuit is given by the formula

Rt=1/1/R1+1/R2
Simplify the formula. Help please?