exam Maths Puzzle Numerical Ability

solve thiz equation -7x - 18 =3

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exam Other Question

If f(x)=x^2-6x+8, what is the value of f(7)-f(3)?

a. -1
b. 0
c. 14
d. 15
e. 16 Rewrite the equation so that y is a function of x

Please explain and show work on each step so that I will fully understand this for the future problems that I have. THANK YOU!

3(x-2y) = -12(x+2y)