Solve for x
x=-15
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6x+3\left(x+5\right)=4\times 2x
Multiply both sides of the equation by 12, the least common multiple of 2,4,3.
6x+3x+15=4\times 2x
Use the distributive property to multiply 3 by x+5.
9x+15=4\times 2x
Combine 6x and 3x to get 9x.
9x+15=8x
Multiply 4 and 2 to get 8.
9x+15-8x=0
Subtract 8x from both sides.
x+15=0
Combine 9x and -8x to get x.
x=-15
Subtract 15 from both sides. Anything subtracted from zero gives its negation.
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