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X+2x=3
-2x+3x=1
3x=3/:3
x=1
x+2x=3-2x+3x=1
3x=3 /:3
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X+2x=3
3x=3/:3
x=1
-2x+3x=1
x=1
x+2x=3
-2x+3x=1
3x=3 /:3
x=1
x=1
x=1