5x + 4 = 10x - 5 10x - 5x = 4 + 5 5x = 9 x = 1.8
If: 10x+7 = 5x+22 Then: 10x-5x = 22-7 And: 5x = 15 So: x = 3
30 + 5x = 15 + 10x 30 = 15 + 5x 15 = 5x x = 3
10x - 18 = 5x + 2 Add -5x + 18 to both sides of the equation, to get: 5x = 20, from which x = 4.
6-3x = 5x-10x+2 4 = 8x-10x 4 = -2x x = -2
5x + 4 = 10x - 5 10x - 5x = 4 + 5 5x = 9 x = 1.8
If: 10x+7 = 5x+22 Then: 10x-5x = 22-7 And: 5x = 15 So: x = 3
5x+8 = 10x+35x-10x = 3-8-5x = -5x = 1 and by substituting the value of x into the equations y = 13
30 + 5x = 15 + 10x 30 = 15 + 5x 15 = 5x x = 3
10x - 5x + 5x = 10x
-10x + 5x = -5x
x = 10x, so derivative = 10
10x - 18 = 5x + 2 Add -5x + 18 to both sides of the equation, to get: 5x = 20, from which x = 4.
x=-3
6-3x = 5x-10x+2 4 = 8x-10x 4 = -2x x = -2
10x + 2y + 8z - 5x + 4z - 4y = 10x - 5x + 2y - 4y + 8z + 4z = (10 - 5)x + (2 - 4)y + (8 + 4)z = 5x - 2y + 12z
45-5x = 5x+55 -5x-5x = 55-45 -10x = 10 x = -1