Solve for x
x=45
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3x+20-4x=-25
Subtract 4x from both sides.
-x+20=-25
Combine 3x and -4x to get -x.
-x=-25-20
Subtract 20 from both sides.
-x=-45
Subtract 20 from -25 to get -45.
x=45
Multiply both sides by -1.
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