1.
[tex] - 4x + 5x + 2x = 3x[/tex]
[tex] - \frac{1}{3}x \times 15 + 2x - 10 = - 5x + 2x - 10 = - 3x - 10 = - (3x + 10)[/tex]
[tex]4z + 5z - 7z = 2z[/tex]
[tex]5x - 8.5x = - 3.5x[/tex]
[tex]3 \frac{1}{2} - x + 0.3x - 2 = - 0.7x + 1 \frac{1}{2} = - (0.7x - 1 \frac{1}{2})[/tex]
2.
[tex]0.25a + 0.75a = a[/tex]
[tex] \frac{1}{4}c + 4 \frac{3}{4}c = 5c[/tex]
[tex] - a + 2a = a[/tex]
[tex]2.5x - 2.5x = 0[/tex]
3.
[tex]2 \times 4x + 2 \times 5x = 8x + 10x = 18x[/tex]
[tex]3 \times 2y = 6y[/tex]
[tex]2b \times 7 = 14b[/tex]
