exam Maths Puzzle Numerical Ability

Can someone help me solve this problem?

8x -11 = 2x + 1

Thanks, Lisa

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exam Other Question

write equation in standard form?

y+9=-3(x-2)
The combined resistance of two resistors R1 and R2 in parallel circuit is given by the formula. Simplify the formula
Rt= 1
------------
1/R1 + 1/R2