10x + 7x = 8x – 9
10x + 7x – 8x = – 9
9x = -9
x = -1
20 – 3x = 2x – 45
– 3x – 2x = – 45 – 20
-5x = -65
x = 13
10x + 7x = 8x – 9
10x + 7x – 8x = – 9
9x = -9
x = -1
20 – 3x = 2x – 45
– 3x – 2x = – 45 – 20
-5x = -65
x = 13