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5\left(7x+3\right)+6\left(2x-7\right)=-450
Multiply both sides of the equation by 30, the least common multiple of 6,5.
35x+15+6\left(2x-7\right)=-450
Use the distributive property to multiply 5 by 7x+3.
35x+15+12x-42=-450
Use the distributive property to multiply 6 by 2x-7.
47x+15-42=-450
Combine 35x and 12x to get 47x.
47x-27=-450
Subtract 42 from 15 to get -27.
47x=-450+27
Add 27 to both sides.
47x=-423
Add -450 and 27 to get -423.
x=\frac{-423}{47}
Divide both sides by 47.
x=-9
Divide -423 by 47 to get -9.