Solve for x
x=7.5
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78+x\times 4.6=5\left(15+x\right)
Multiply 15 and 5.2 to get 78.
78+x\times 4.6=75+5x
Use the distributive property to multiply 5 by 15+x.
78+x\times 4.6-5x=75
Subtract 5x from both sides.
78-0.4x=75
Combine x\times 4.6 and -5x to get -0.4x.
-0.4x=75-78
Subtract 78 from both sides.
-0.4x=-3
Subtract 78 from 75 to get -3.
x=\frac{-3}{-0.4}
Divide both sides by -0.4.
x=\frac{-30}{-4}
Expand \frac{-3}{-0.4} by multiplying both numerator and the denominator by 10.
x=\frac{15}{2}
Reduce the fraction \frac{-30}{-4} to lowest terms by extracting and canceling out -2.
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