What must be added to -17x to get 4x?
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Let the number be a
-17x+a=4xa=21x
-17x+a=4xa=21x
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let the number added be y
-17x + y = 4x
y = 4x + 17x
y = 21x
no added = 21x
-17x + y = 4x
y = 4x + 17x
y = 21x
no added = 21x
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