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273 13+8 = 21 and 13*21 = 273
2x-3y=13
13
If 5x plus 3y equals 13, the x equals 2 and y equals 1. This is because 5x2=10 and 3x1=3, and 10+3=13.
In the equation 3x plus 7 equals 13, x is equal to 2.