exam Maths Puzzle Numerical Ability

I need help with these type of equations please,
-9h=-3(-3)

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exam Other Question

Solve.

The combined resistance of two resistors r1 and r2 in a parallel circuit is given by the formula rt= 1 OVER 1/r1 + 1/r2. Simplify the formula. Solve for x.

m<AOB=4x-2, m<BOC=5x+10, m<COD=2x+14