exam Maths Puzzle Numerical Ability

Hi,
how can I solve problems that have variables in both sides?

for example 25y/36 = 33/2y

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exam Other Question

Which of the following is not a true statement about lines in a plane?
a. Lines continue forever in both directions.
b. All lines are curves
c. Any two lines must either interse Perform indicated operations

(x^2-11x+4)-(-2x^2+2x-6)-(X^2+6x-5)

Completely lost again! Thanks