Answer:
Step-by-step explanation:
9x-7=-7
9x - 7 + 7 = -7 + 7
9x= 0
x = 0
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x=0
add 7 to both sides
9x=0
divide both sides by 9
x=0/9
to check
plug in 0 for x in the equation
9(0)-7=-7
9×0=0
0-7=-7
-7=-7
