#### Answer

$x=-2.4$

#### Work Step by Step

Subtract $0.7x$ and $0.3$ to both sides of the equation to obtain:
$$1.2x+0.3-0.7x-0.3=0.7x-0.9-0.7x-0.3
\\0.5x=-1.2$$
Divide $0.5$ to both sides of the equation to obtain:
$$\dfrac{0.5x}{0.5}=\dfrac{-1.2}{0.5}
\\x = -2.4$$