7x^2-4x+9 , 8x-15, 6+ 2x^2
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Step-by-step explanation:
1) 49x-4x=9
= 45x=9
= x=9÷45
= x=5
2) 8x-15
=x=15÷8
3)6+2x^2
=4x=6
=x=6÷4
=x=3
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