y = 5x3 + 5 is a cubic equation. You cannot solve for x (or y), because there are two variables and only one equation. If you graph this, however, you will see a curve that passes through all possible points that make this equality true.
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y = 5x3 + 6 is a cubic equation, not a linear equation. Linear equations contain only terms of degree 0 (i.e. constants) and terms of degree 1.
y equals x plus 5 is the equation of a straight line in the x-y plane.
y = 5
y=5-x
The answer is y+5, unless y can be defined as a number.