54x+135-640x+856=252x-630-39

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To simplify the equation, we first combine like terms on both sides:

54x + 135 - 640x + 856 = 252x - 630 - 39
Combine like terms on the left side:
-586x + 991 = 252x - 669
Move variables to one side and constants to the other:
-586x - 252x = -669 - 991
-838x = -1660
Divide by -838 to solve for x:
x = -1660 / -838
x = 1.98

Therefore, the solution to the equation is x = 1.98.