若式子5x-7与4x+9互为相反数,则x=________

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若式子5x-7与4x+9互为相反数,则x=________若式子5x-7与4x+9互为相反数,则x=________若式子5x-7与4x+9互为相反数,则x=________若式子5x-7与4x+9互

若式子5x-7与4x+9互为相反数,则x=________
若式子5x-7与4x+9互为相反数,则x=________

若式子5x-7与4x+9互为相反数,则x=________
若式子5x-7与4x+9互为相反数,则x=__-2/9______
5x-7=-(4x+9)
2=-4x-5x
x=-9x
x=-2/9

因为互为相反数和为零
5x-7+4x+9=0
9x=-2
x=-2/9