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18x-84-2\left(2x+7\right)=3\left(5x-7\right)
Multiply both sides of the equation by 6, the least common multiple of 3,2.
18x-84-4x-14=3\left(5x-7\right)
Use the distributive property to multiply -2 by 2x+7.
14x-84-14=3\left(5x-7\right)
Combine 18x and -4x to get 14x.
14x-98=3\left(5x-7\right)
Subtract 14 from -84 to get -98.
14x-98=15x-21
Use the distributive property to multiply 3 by 5x-7.
14x-98-15x=-21
Subtract 15x from both sides.
-x-98=-21
Combine 14x and -15x to get -x.
-x=-21+98
Add 98 to both sides.
-x=77
Add -21 and 98 to get 77.
x=-77
Multiply both sides by -1.