36 of 100: Add Seven Subtract One

Logic Level 1

\[\Large 1 \; \square \; 2 \; \square \; 3\; \square \; 4\; \square \; 5 \; \square \; 6 \; \square \; 7 \; \square \; 8 \; = 30\]

Six out of the seven "\(\square\)"s above contain addition signs, and the remaining "\(\square\)" contains a subtraction sign.

Where should the subtraction sign go to make the equation true?

Can you solve this puzzle without using guess-and-check at all? Strategy hint: what would the sum be if all the squares had addition signs?

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