$$( \frac { - 3 } { 4 } ) + 3 = 3 + ( - \frac { - 3 } { 4 } ) =$$
$\text{false}$
$$-\frac{3}{4}+3=3-\frac{-3}{4}$$
$$-\frac{3}{4}+\frac{12}{4}=3-\frac{-3}{4}$$
$$\frac{-3+12}{4}=3-\frac{-3}{4}$$
$$\frac{9}{4}=3-\frac{-3}{4}$$
$$\frac{9}{4}=3-\left(-\frac{3}{4}\right)$$
$$\frac{9}{4}=3+\frac{3}{4}$$
$$\frac{9}{4}=\frac{12}{4}+\frac{3}{4}$$
$$\frac{9}{4}=\frac{12+3}{4}$$
$$\frac{9}{4}=\frac{15}{4}$$
$$\text{false}$$
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