2b = {-14 * 2; 8 * 2} = {-28; 16}
c = a + 2b = {-1 + (-28); 7 + 16} = {-29; 23}
d = b - a = {-14 - (-1); 8 - 7} = {-13; 1}
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2b = {-14 * 2; 8 * 2} = {-28; 16}
c = a + 2b = {-1 + (-28); 7 + 16} = {-29; 23}
d = b - a = {-14 - (-1); 8 - 7} = {-13; 1}