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The given expression is 5x + 2y + 19x - 2y - 1. To simplify this expression, we combine like terms. Combining the x terms gives us 24x (5x + 19x) and combining the y terms gives us 0y (2y - 2y). Therefore, the simplified expression is 24x - 1.
If you mean x+2y = 5 then yes
5x = 5 times 9, 2y = 2 times 4 so 45 - 8 ie 37