d/dx (3x+25)=3
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9x2 + 30x + 25
10 -3x+8x = 25 -3x+8x = 25-10 5x = 15 x = 3
-3x + (-18) = 2x + 7 +18 +18 -3x = 2x +25 -2x -2x -5x = 25 ----- ----- -5 -5 x=-5 *------- equals a division line
If: 8x-4 = 3x+21 Then: 8x-3x = 21+4 => 5x = 25 => x = 25/5 Therefore: x = 5
x = 3