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3\left(3x+1\right)=30-4\left(x-3\right)
Multiply both sides of the equation by 15, the least common multiple of 5,15.
9x+3=30-4\left(x-3\right)
Use the distributive property to multiply 3 by 3x+1.
9x+3=30-4x+12
Use the distributive property to multiply -4 by x-3.
9x+3=42-4x
Add 30 and 12 to get 42.
9x+3+4x=42
Add 4x to both sides.
13x+3=42
Combine 9x and 4x to get 13x.
13x=42-3
Subtract 3 from both sides.
13x=39
Subtract 3 from 42 to get 39.
x=\frac{39}{13}
Divide both sides by 13.
x=3
Divide 39 by 13 to get 3.