1. (22+а)-7 = 22+а-7 = 15+а
2. <span>(с+84)-48 = с+84-48 = с+36
3. </span><span>69-(m+12) = 69-m-12 = 57-m
4. </span><span>316-(95-b) = 316-95+b = 221+b</span>
1) 180-30=150
2) 180-75=105
3) 90-55=35
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