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5\left(x+3\right)=20+4\left(3x-10\right)
Multiply both sides of the equation by 20, the least common multiple of 4,5.
5x+15=20+4\left(3x-10\right)
Use the distributive property to multiply 5 by x+3.
5x+15=20+12x-40
Use the distributive property to multiply 4 by 3x-10.
5x+15=-20+12x
Subtract 40 from 20 to get -20.
5x+15-12x=-20
Subtract 12x from both sides.
-7x+15=-20
Combine 5x and -12x to get -7x.
-7x=-20-15
Subtract 15 from both sides.
-7x=-35
Subtract 15 from -20 to get -35.
x=\frac{-35}{-7}
Divide both sides by -7.
x=5
Divide -35 by -7 to get 5.