-2(-3f+6)
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What's the question, do you want to simplify that?You can combine the like terms - the terms that contain variable "f". Then, you can either leave it that way, or you can open the parentheses.
3e+7e = 10e
2e - 12 = 7e + 8Add 12 to both sides: 2e = 7e + 20 subtract 7e from both sides: -5e = 20 divide both sides by -5: e = -4
7e
4e-1 = 7 Multiply both sides by e: 4 = 7e Divide both sides by 7: 4/7 = e