Question

8x+9-10x=4x-13-7x
6y+6y-10=7y+12+3y
15+8x-5+x=4x-3+x+1
3x+21-4x-30=14-x+4+3x
12x+4+3=40+6x-4x+10
ayuda pliss

Answer 1

1.

$8x + 9 - 10x = 4x - 13 - 7x \\ 9 + 13 = 4x - 7x - 8x + 10x \\ 22 = - x \\ - 22 = x$

2.

$6y + 6y - 10 = 7y + 12 + 3y \\ 6y + 6y - 7y - 3y = 12 + 10 \\ 2y = 22 \\ y = \frac{22}{2} \\ y = 11$

3.

$15 + 8x - 5 + x = 4x - 3 + x + 1 \\ 8x + x - 4x - x = - 3 + 1 - 15 + 5 \\ 4x = - 12 \\ x = \frac{ - 12}{4} \\ x = - 3$

4.

$3x + 21 - 4x - 30 = 14 - x + 4 + 3x \\ 21 - 30 - 14 - 4 = - x + 3x - 3x + 4x \\ - 27 = 3x \\ \frac{ - 27}{3} = x \\ - 9 = x$

5.

$12x + 4 + 3 = 40 + 6x - 4x + 10 \\ 4 + 3 - 40 - 10 = 6x - 4x - 12x \\ - 43 = - 10x \\ \frac{43}{10} = x$

listo :)