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56x+12=14x−2\frac{5}{6}x+12=\frac{1}{4}x-265x+12=41x−2 (a)
−0,4(3x−1)+8(0,8x−0,3)=5−(3,8x+4)-0,4\left(3x-1\right)+8\left(0,8x-0,3\right)=5-\left(3,8x+4\right)−0,4(3x−1)+8(0,8x−0,3)=5−(3,8x+4) (a)
x2−2x+1x2−1=0\frac{x^2-2x+1}{x^2-1}=0x2−1x2−2x+1=0 (a)
2x7+x4=1514\frac{2x}{7}+\frac{x}{4}=\frac{15}{14}72x+4x=1415 (a)
2x2+3x+12x+1−x=1\frac{2x^2+3x+1}{2x+1}-x=12x+12x2+3x+1−x=1 (a)
2x2−2xx2−4+6x+2=x+2x−2\frac{2x^2-2x}{x^2-4}+\frac{6}{x+2}=\frac{x+2}{x-2}x2−42x2−2x+x+26=x−2x+2
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4y+245y2−45+y+35y2−15y=y−3y2+3y\frac{4y+24}{5y^2-45}+\frac{y+3}{5y^2-15y}=\frac{y-3}{y^2+3y}5y2−454y+24+5y2−15yy+3=y2+3yy−3 (a)
4x−3+1x=5x−2\frac{4}{x-3}+\frac{1}{x}=\frac{5}{x-2}x−34+x1=x−25 (a)
7x2+2x+x+1x2−2x=x+4x2−4\frac{7}{x^2+2x}+\frac{x+1}{x^2-2x}=\frac{x+4}{x^2-4}x2+2x7+x2−2xx+1=x2−4x+4 (a)
x+5x−2−x+3x+2=2x2−4\frac{x+5}{x-2}-\frac{x+3}{x+2}=\frac{2}{x^2-4}x−2x+5−x+2x+3=x2−42 (a)
(x−a)(x−2a−7)x−5=0\frac{\left(x-a\right)\left(x-2a-7\right)}{x-5}=0x−5(x−a)(x−2a−7)=0
x−2ax−4=0\frac{x-2a}{x-4}=0x−4x−2a=0
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