7x^2-28=0
x^2=4
x=2, x=-2
7x²-28=0
7x²=28
x²=28:7
x²=4
x=-2; x=2
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Verified answer
7x^2-28=0
x^2=4
x=2, x=-2
7x²-28=0
7x²=28
x²=28:7
x²=4
x=-2; x=2