The answer is -4. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
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20+18+13+9=60
17 + 13 + 12 + 12 + 6 + 9 = 69.
13
13...... 9 plus 5 equals 14...... 14 minus 1 equals 13
The answer to the problem of 13 equals -4x plus 9 is x equals -1.