Wait. I'm going to get my pencil.
The mechanism is to clear the parentheses and isolate the variable from the constants.
9x-4=4(x-1)-5x+4 9x -4 = 4x -4 -5x +49x -4 = 4x -5x9x -4 = -1x10x = 4 x = 0.4 (or 2/5)
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