You can't. No matter what you can not know the value of one of the variables without knowing the value of the other. All the possible values they could be can be represented on a graph by the line (rearranged from the equation): y = x - 4.5
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You cannot solve one linear equation with two unknown variables.
You cannot solve one linear equation with two variables.
It is not possible to solve one linear equation in two unknown variables.
A linear equation in 3 unknown variables cannot be solved.
It is not possible to solve a single linear equation in two unknown variables (b and t).