2x+1=y+22y-1=x+y+1
{ 2x + 1 = y + 2 /-2
{ 2y - 1 = x + y + 1 /-y
{ y = 2x - 1
{ y - 1 = x + 1
{ 2x - 1 - 1 = x + 1 /-x
{ x - 2 = 1 /+2
{ y = 2 * 3 - 1
{ x = 3
{ y = 5
2x+1=y+2
2x-y=2-1
2x-y=1
2y-1=x+y+1
2y-y-x=1+1
y-x=2
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{ 2x + 1 = y + 2 /-2
{ 2y - 1 = x + y + 1 /-y
{ y = 2x - 1
{ y - 1 = x + 1
{ y = 2x - 1
{ 2x - 1 - 1 = x + 1 /-x
{ y = 2x - 1
{ x - 2 = 1 /+2
{ y = 2 * 3 - 1
{ x = 3
{ y = 5
{ x = 3
2x+1=y+2
2x-y=2-1
2x-y=1
2y-1=x+y+1
2y-y-x=1+1
y-x=2