2 answers:
7x-9=-4x+90
You need to put x in one side.
So it will be 7x+4x=90+9
11x=99 now divide 11 on both sides
11x/11 = 99/11
So final answer is x=9
7x - 9 = -4x + 90
11x - 9 = 90
11x = 99
x = 9
You can check by substituting the 9 for the x value.
7(9) - 9 = -4(9) + 90
63 - 9 = -36 + 90
54 = 54
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hope this helps :-)
