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5\times 2\left(x+5\right)+30=3\times 4x
Multiply both sides of the equation by 15, the least common multiple of 3,5.
10\left(x+5\right)+30=3\times 4x
Multiply 5 and 2 to get 10.
10x+50+30=3\times 4x
Use the distributive property to multiply 10 by x+5.
10x+80=3\times 4x
Add 50 and 30 to get 80.
10x+80=12x
Multiply 3 and 4 to get 12.
10x+80-12x=0
Subtract 12x from both sides.
-2x+80=0
Combine 10x and -12x to get -2x.
-2x=-80
Subtract 80 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-80}{-2}
Divide both sides by -2.
x=40
Divide -80 by -2 to get 40.