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4x²=83+5
4x²=88 /:4
x²=22
x=√22 v x=-√22
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-3x²=93 /:(3)
-x²= 31
-x²≤0
x=-√31
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x²+2x+7=5x²-86+2x
x²-5x²+2x-2x=-86-7
-4x²=-93 /:(-4)
x²=93/4
x=√93/√4 =√93/2
lub
x=-√93/2