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You cannot solve an expression. You can only simplify it. Assuming you mean simplify, you do this by combining like terms. Since both terms have an "r" in them, you simply add the coefficients together.
Example: 5x + 2x would be 7x
Example: -3y + 8y would be 5y
Example: -2p - 4p would be -6p
You should be able to simplify your problem now.
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