exam Maths Puzzle Numerical Ability

How do you solve 3(2x+5)=39?

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exam Other Question

simplify:
(-7 square root sign - sqrt sign 7) (sqrt sign 7 - 10 sqrt sign 11)
(cos250*cos25) + (sin250*sin25)

a.k.a. (the cosine of 250 degrees multiplied by the cosine of 25 degrees) plus (the sine of 250 degrees multiplied by the sine of 25 degrees)