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y+7=4x^2+3x
y=-2x^2+3x-1
-2x²+3x-1+7=4x²+3x
y=-2x^2+3x-1
-2x²+3x+6=4x²+3x
y=-2x^2+3x-1
-6x²=-6
y=-2x^2+3x-1
x²=1
y=-2x^2+3x-1
x=1
y=-2+2
x=1
y=0
x=1
B) y-x^2=5-4x
y+2x^2+5=7x
y=5-4x+x²
y=7x-2x²-5
5-4x+x²=7x-2x²-5
y=7x-2x²-5
-11x+3x²=-10
y=7x-2x²-5
C) x^2+1=y
x^2+3x+y=3
x²+3x+x²+y=3
x^2+1=y
2x²+3x+y=3
x^2+1=y
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