5x - 8y - 7x + 11y =
5 - (6x - 4) + (-2x + 1) =
3y(5 - 7x + y) =
(x + 3)( 2x - 1 ) =
3 - 3( x + 3 ) = 12 + 3x
2x + 1 / 2x = x + 3 / x -1 / - kreska ułamkowa
1 - 2x + 5 / 3 4
5x - 2y + 21
3x + 5y = -6
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5x - 8y - 7x + 11y = -2x + 3y
5 - (6x - 4) + (-2x + 1) = 5 - 6x + 4 + -2x + 1 = 10 - 8x
3y(5 - 7x + y) =15y - 21xy + 3y^2
(x + 3)( 2x - 1 ) =2x^2 - x + 6x - 3 = -3 + 7x + 2x^2