2.5(16+x²+8x)+7(25-x²)=295-4.5x²
40+2.5x²+20x+175-7x²=295-4.5x²
2.5x²+4.5x²-7x²+20x=295-40-175
20x=80
x=4
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2.5(16+x²+8x)+7(25-x²)=295-4.5x²
40+2.5x²+20x+175-7x²=295-4.5x²
2.5x²+4.5x²-7x²+20x=295-40-175
20x=80
x=4