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3\left(2x+3\right)=10\left(-x\right)+15x
Multiply both sides of the equation by 15, the least common multiple of 5,3.
6x+9=10\left(-x\right)+15x
Use the distributive property to multiply 3 by 2x+3.
6x+9-10\left(-x\right)=15x
Subtract 10\left(-x\right) from both sides.
6x+9-10\left(-x\right)-15x=0
Subtract 15x from both sides.
6x+9-10\left(-1\right)x-15x=0
Multiply -1 and 10 to get -10.
6x+9+10x-15x=0
Multiply -10 and -1 to get 10.
16x+9-15x=0
Combine 6x and 10x to get 16x.
x+9=0
Combine 16x and -15x to get x.
x=-9
Subtract 9 from both sides. Anything subtracted from zero gives its negation.