Приведи подобные слагаемые:

а) $4x - 6y - 3x + 5y = (4x - 3x) + (-6y + 5y) = x - y$ б) $7y - 9y + 2x + 2y = (7y - 9y + 2y) + 2x = 0y + 2x = 2x$ в) $y - 2x - y + x = (y - y) + (-2x + x) = 0 - x = -x$ г) $0,3y - 0,1x - 0,9x + 0,7y = (0,3y + 0,7y) + (-0,1x - 0,9x) = 1y - 1x = y - x$ д) $\frac{1}{5}x - 2,8y - 0,2x + \frac{4}{5}y = 0,2x - 2,8y - 0,2x + 0,8y = (0,2x - 0,2x) + (-2,8y + 0,8y) = 0 - 2y = -2y$ е) $-\frac{3}{5}y + 1\frac{1}{2}x + 1,6y - 0,5x = -0,6y + 1,5x + 1,6y - 0,5x = (1,5x - 0,5x) + (-0,6y + 1,6y) = 1x + 1y = x + y$ ж) $\frac{1}{3}y - \frac{1}{3}x + \frac{1}{3}y + \frac{1}{3}x + \frac{1}{3}y = (\frac{1}{3}y + \frac{1}{3}y + \frac{1}{3}y) + (-\frac{1}{3}x + \frac{1}{3}x) = 1y + 0x = y$