Solving for two unknowns (x and y) requires two independent equations.
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many solutions
-4x+3 = 23+6x -4x-6x = 23-3 -10x = 20 x = -2
You cannot solve one linear equation with two variables.
5+4x-7 = 4x+3-x 4x-2 = 3x+3 4x-3x = 3+2 x = 5
4x+7-3x = 15 4x-3x = 15-7 x = 8