exam Maths Puzzle Numerical Ability

y=10e-[-ln(1/2)/21.77](19)

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exam Other Question

4(x-1)+2=3x+8-2x Can anyone give me some help with this one? I always get the signs turned around on these. Thanks

2x + 4 = 12 solve for x

There are ABSOLUTE VALUE signs on the left of the 2x and on the right of 4. Thanks Again.