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-3x=5x+8

Let's solve your equation step-by-step.−3x=5x+8Step 1: Subtract 5x from both sides.−3x−5x=5x+8−5x−8x=8Step 2: Divide both sides by -8.−8x−8=8−8x=−1 Answer =-1 I used a calculator 
 

Here is the work from step to step. hope you can understand it.
-3x=5x+8
=-5x -5x
=2x=8
=2x/2=8/2
=x=4
answer- 4