0.7 + 0.5x + 1 = 0.4x - 1.2

Combine like terms:

0.5x + 1.7 = 0.4x -1.2

Subtract 0.4x from both sides:

0.1x + 1.7 = -1.2

Subtract 1.7 from both sides:

0.1x = -2.9

Divide by 0.1:

x = -29