It can be anything.
Example: x=1
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2x+3 = 7 2x = 7-3 2x = 4 x = 2
3x+4 = 2x-3 3x-2x = -3-4 x = -7
2x + 3y = 9x = 3, y = 1 therefore 6 + 3 = 9
2x + 3 = 9x Subtract 2x from both sides: 3 = 7x Divide both sides by 7: 3/7 = x
2x + 2/3= 5/3 2x= 3/3 2x=1 x=1/2