7b-6.5b=?5a+7.8a=?7.5x-4.2x=?3a-2a=?8x+5x=?2y+3.4y=?3.5x-3.4x=?b+9b=?

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7b-6.5b=?5a+7.8a=?7.5x-4.2x=?3a-2a=?8x+5x=?2y+3.4y=?3.5x-3.4x=?b+9b=?
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7b-6.5b=?5a+7.8a=?7.5x-4.2x=?3a-2a=?8x+5x=?2y+3.4y=?3.5x-3.4x=?b+9b=?
7b-6.5b=?
5a+7.8a=?
7.5x-4.2x=?
3a-2a=?
8x+5x=?
2y+3.4y=?
3.5x-3.4x=?
b+9b=?

7b-6.5b=?5a+7.8a=?7.5x-4.2x=?3a-2a=?8x+5x=?2y+3.4y=?3.5x-3.4x=?b+9b=?
7b-6.5b=0.5b
5a+7.8a=12.8a
7.5x-4.2x=3.3x
3a-2a=a
8x+5x=13x
2y+3.4y=5.4x
3.5x-3.4x=0.1x
b+9b=10b