2×(2×x+3×x)=20
4x + 6x = 20
10x = 20
x = 2
9×(5×x+8)=207
45x + 72 = 207
45x = 207 – 72
45x = 135
x = 3
x – 2x – 5 = 10
x – 2x = 10 + 5
-x = 15
x = -15
2×(2×x+3×x)=20
4x + 6x = 20
4x + 6x = 20
10x = 20
x = 2
9×(5×x+8)=207
45x + 72 = 207
45x = 207 – 72
45x = 135
x = 3
x – 2x – 5 = 10
x – 2x = 10 + 5
-x = 15
x = -15