It depends on what you mean by "solving", with two unbound variables (x and y) you will be able to produce a two-dimensional x/y plot: 2x+y=4 means y=4-2x
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3x+4 = 2x-3 3x-2x = -3-4 x = -7
2x+3 = 7 2x = 7-3 2x = 4 x = 2
2x + 1 = 9 2x = 9 - 1 2x = 8 2x/2 = 8/2 x=4
y=16 x= -4
x = 4 and y = 0