4x + (28x -2) is not an equation. It doesn't ask a question, so it doesn't need
answering or solving.
The expression stands for a number. In order to know the number, you first
have to know what number 'x' is.
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5+4x-7 = 4x+3-x 4x-2 = 3x+3 4x-3x = 3+2 x = 5
-4x+3 = 23+6x -4x-6x = 23-3 -10x = 20 x = -2
Add 4x + 2x = 6x + 4 = 6x + 4
4x+7-3x = 15 4x-3x = 15-7 x = 8
2*2+4x-9=0 4x=9-4 4x=5 x=5/4