c=3
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It equals 90
A) more than 30c B) at or about 30c C) less than 30c The correct answer is A) more than 30c
If you mean: 15a = 6a - 90 then the variable a works out as -10. If you mean 15a + 6a - 90, then it equals 21a - 90.
90 + 90 + 60 = 240
20 x 90 = 180020 times 90 equals 18 times 100 equals 1800.