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2x+4+7x-4 is the same as 9x
answer is 4 7x+19=-2x+55 +2x +2x 9x+19= 0 55 -19 -19 9x = 36 9 9 =4
7x + 19 = -2x + 55Add 2x to both sides:9x + 19 = 55Subtract 19 from both sides:9x = 36Divide both sides by 9x = 4
-4(7x-3y-z)-(-6)(9x-z+2)
The expression simplifies to: -7x-4