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-28=-7(3x+4)+21x thank you to anyone who helps
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-28=-7(3x+4)+21x thank you to anyone who helps

User Kiminoa
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-28=-7(3x+4)+21x\\\\\implies -21x -28 +21x = -28\\\\\implies -28 =-28\\\\\text{The equation is true for all x.}

User Mike Diglio
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