Mathematics, 28.07.2019 23:00, sistersaray

Tamara subtracted -5x+9 from another expression and got 12x+a. when she subtracted 3x+4 from the same expression she got bx-7. from what expression did she subtract -5x+9 and 3x+4?

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Tamara subtracted -5x+9 from another expression and got 12x+a. when she subtracted 3x+4 from the sam...