equation is an expression equated to a value..what you have written is an expression. when equated to a value or any other expression makes it an equation.
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6x+5k=12
-1
Without an equality sign it can't be considered to be an equation
It is a linear expression in one variable, x. It is not an equation and so cannot be solved. It can be simplified to -6x-27.
It is a linear equation in the single variable,x, which is equivalent to x = -18