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6\left(5x-4\right)+21\left(7-x\right)=210-7\left(x+1\right)
Multiply both sides of the equation by 42, the least common multiple of 7,2,6.
30x-24+21\left(7-x\right)=210-7\left(x+1\right)
Use the distributive property to multiply 6 by 5x-4.
30x-24+147-21x=210-7\left(x+1\right)
Use the distributive property to multiply 21 by 7-x.
30x+123-21x=210-7\left(x+1\right)
Add -24 and 147 to get 123.
9x+123=210-7\left(x+1\right)
Combine 30x and -21x to get 9x.
9x+123=210-7x-7
Use the distributive property to multiply -7 by x+1.
9x+123=203-7x
Subtract 7 from 210 to get 203.
9x+123+7x=203
Add 7x to both sides.
16x+123=203
Combine 9x and 7x to get 16x.
16x=203-123
Subtract 123 from both sides.
16x=80
Subtract 123 from 203 to get 80.
x=\frac{80}{16}
Divide both sides by 16.
x=5
Divide 80 by 16 to get 5.