exam Maths Puzzle Numerical Ability

can you explain algebra to me and how to work out math equations and help me on making letters subjects eg x= 4x a
thanks

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exam Other Question

y=/-3x/ Please help me solve this problem, it is from a worksheet:

the measure of angle b, the complement of angle a is 1/6th the measure of angle c, the supplement of angle a Find the measure of each angle