Solve for x
x=3
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7.8+0.7x=1.1\left(6+x\right)
Multiply 1.3 and 6 to get 7.8.
7.8+0.7x=6.6+1.1x
Use the distributive property to multiply 1.1 by 6+x.
7.8+0.7x-1.1x=6.6
Subtract 1.1x from both sides.
7.8-0.4x=6.6
Combine 0.7x and -1.1x to get -0.4x.
-0.4x=6.6-7.8
Subtract 7.8 from both sides.
-0.4x=-1.2
Subtract 7.8 from 6.6 to get -1.2.
x=\frac{-1.2}{-0.4}
Divide both sides by -0.4.
x=\frac{-12}{-4}
Expand \frac{-1.2}{-0.4} by multiplying both numerator and the denominator by 10.
x=3
Divide -12 by -4 to get 3.
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