-12 since
9-4x=57 so
57-9=4x
-48=4x
x=-12
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4x - 20 = -44x = 16x = 4
Presumably this is a simultaneous equation in the form of: -4x+3y = 27 -2x+y = -1 Multiply all terms of the bottom equation by 2: -4x+3y = 27 -4x+2y = -2 Subtract the bottom equation from the top equation remembering that a - - is equal to a + Meaning that -4x - -4x = 0 and 27 - -2 = 29: So y will = 29 Substitute the value of y into the original equations to find the value of x Therefore: x = 15 and y = 29
If the missing signs are pluses, x = 16.
If the questions asks: (3)/(4x+2) = (5)/(4x-6) then x = -(7/4)
4x= y