book Maths Puzzle Numerical Ability

practice 2.2
Can you help me solve for x .thank you

3/7 x =15

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book Other Question

a line passes through a(1,-3) and b(2,7)
write the equation of a line perpendicular to a. how would you go about solving this problem? I study and do well on homework but for some reason I forget everything when I take a test, What do i do?