You cannot solve one linear equation in two unknown variables (x and y), although some non-linear equations will suffice. You need two independent linear equations.
All you can do is express one of the variables in terms of the other, but that is not solving the equation.
366
58 + 7 + 7 = 72
58 + 37 = 95
105
58
The commutative property of addition.
58
58
275
58 x 58 = 116 WRONG
15x = -75, x = -5
58.