$$+1-[-4+(-10)/(-5)]+[+3+(-9)/(-9)]$$
$7$
$$1-\left(-4+\frac{-10}{-5}\right)+3+1$$
$$1-\left(-4+2\right)+3+1$$
$$1-\left(-2\right)+3+1$$
$$1+2+3+1$$
$$3+3+1$$
$$6+1$$
$$7$$
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