Fill in the blanks — task. Mathematics State Board, Class 7.

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(i)

$(-30) +$

$=$

$60$

(ii)

$(-5) +$

$=$

$-100$

(iii)

$(-52) + (-52) =$

(iv)

$+ (-22) = 0$

(v)

$+ (-70) = 70$

(vi)

$20 + 80 +$

$= 0$

(vii)

$75 + (-25) =$

(viii)

$171 +$

$=$

$0$

(ix)

$[(-3) + (-12)] + (-77) =$

$+ [(-12) + (-77)]$

(x)

$(-42) + [$

$+ (-23)] = [$

$+ 15] +$

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