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8\left(8+5x\right)+7\left(3x-4\right)=56x+56
Multiply both sides of the equation by 56, the least common multiple of 7,8.
64+40x+7\left(3x-4\right)=56x+56
Use the distributive property to multiply 8 by 8+5x.
64+40x+21x-28=56x+56
Use the distributive property to multiply 7 by 3x-4.
64+61x-28=56x+56
Combine 40x and 21x to get 61x.
36+61x=56x+56
Subtract 28 from 64 to get 36.
36+61x-56x=56
Subtract 56x from both sides.
36+5x=56
Combine 61x and -56x to get 5x.
5x=56-36
Subtract 36 from both sides.
5x=20
Subtract 36 from 56 to get 20.
x=\frac{20}{5}
Divide both sides by 5.
x=4
Divide 20 by 5 to get 4.