exam Maths Puzzle Numerical Ability

if i have an equation like -3x=2y-10 if i was to solve for y would it be 5+-1.5=y?

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exam Other Question

I tried to use the sqrt property to solve the equation. The problem is x^2=9
Will you tell me if I did this correctly?
x^2=9
x=+/-9
x=+/-3
x=3, x=3
Thanks for anyones help. (c+1)/8=c/4
dontgte it at all.