7a in 7abxbx
iii. Bin a? - 8ax +a -axta
1.5 Add 6-3a +b; a -7 -6b and 3b +2-a.
0.6 Add 3b - 7€ +10,5c - 2b - 15,15+12c +b
2.7 Evaluate: 3x2 +5xy - 4y2+x2 - 8xy - 5y2
2.8 Evaluate: 5x - (3x - 4x)
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