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Evaluate 2*9+-12

$2 \cdot 9 + - 12$

Step 1

Replace all occurrences of $+$ $-$ with a single $-$ . A plus sign followed by a minus sign has the same mathematical meaning as a single minus sign because $1 \cdot - 1 = - 1$

$2 \cdot 9 - 12$

Step 2

Multiply $2$ by $9$ .

$18 - 12$

Step 3

Subtract $12$ from $18$ .

$6$

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