book Maths Puzzle Numerical Ability

two thirds X plus four equals nine
2/3 x + 4 = 9 how do you solve and do the work?

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book Other Question

my question is:
find the equation of the line parallel to the graph of 4x+2y=8 and containing (-1,5)
a.y=-2x+9
b.y=2x-9
c.y=2x+7
d.y=-2x+3
thanks for your help! While at the park, I saw boys and dogs. Counting heads, I got 32. Counting legs, I got 104. How many boys and dogs were there?