Is the expression 3t >3 an equation in one variable?
No
The expression 3t > 3 is not an equation with a variable since there is no sign of equality between the numbers or the two sides.
Equation is basically a condition on a variable and is satisfied for a definite value of the variable.
For example, 3t + 3 = 6 is an equation with one variable. Here 't' is the variable and there is a '=' sign between both the sides.
The equation is satisfied for a definite value of 't'.