9x + ? = -5x
let the unknown be y:
9x + y = -5x
y = -5x -9x
y = -14x
Check: 9x + (-14x) = -5x
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9x + ? = -5x
let the unknown be y:
9x + y = -5x
y = -5x -9x
y = -14x
Check: 9x + (-14x) = -5x