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4\left(x+1\right)=5\left(x-3\right)-20
Multiply both sides of the equation by 20, the least common multiple of 5,4.
4x+4=5\left(x-3\right)-20
Use the distributive property to multiply 4 by x+1.
4x+4=5x-15-20
Use the distributive property to multiply 5 by x-3.
4x+4=5x-35
Subtract 20 from -15 to get -35.
4x+4-5x=-35
Subtract 5x from both sides.
-x+4=-35
Combine 4x and -5x to get -x.
-x=-35-4
Subtract 4 from both sides.
-x=-39
Subtract 4 from -35 to get -39.
x=39
Multiply both sides by -1.