Work from the inside out. First, take the "-3" through the parentheses. Then combine the "1" with the "-6" inside the brackets. Then take the "-2" through the brackets. Combine the "3x" with the "6x". This should give you:
. . . . .9x + 10 = 2x
Subtract "9x" from both sides, and then divide through by "-7" to get your final answer.
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