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Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

Which of the following of the following sets of side lengths could not form a triangle?

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =