Solve for x
x=12
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5x+7x+28=172
Use the distributive property to multiply 7 by x+4.
12x+28=172
Combine 5x and 7x to get 12x.
12x=172-28
Subtract 28 from both sides.
12x=144
Subtract 28 from 172 to get 144.
x=\frac{144}{12}
Divide both sides by 12.
x=12
Divide 144 by 12 to get 12.
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