12X - 7 = 4X + 9
subtract 4X from both sides
8X - 7 = 9
add 7 to both sides
8X = 16
divide both sides by 8
X = 2
check
12(2) - 7 = 4(2) + 9
24 - 7 = 8 + 9
17 = 17
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The answer to the problem of 13 equals -4x plus 9 is x equals -1.
4x+5 = -9 4x = -9-5 4x = -14 x = -3.5
-4x + 3y = 9
4x
4x+9=25 4x=16 x=4