36 of 100: Add Seven Subtract One

Logic Level 1

1    2    3    4    5    6    7    8  =30\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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