5x²-276=424-2x²
5x² +2x²-276=424
5x²+2x²=424+276
7x²=424+276
7x²=700
x²=700:7
x²= 100
x1=10, x2= - 10
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5x²-276=424-2x²
5x² +2x²-276=424
5x²+2x²=424+276
7x²=424+276
7x²=700
x²=700:7
x²= 100
x1=10, x2= - 10