Solve for x
x=40
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0.4x-9=0.1x+3
Use the distributive property to multiply 0.1 by x+30.
0.4x-9-0.1x=3
Subtract 0.1x from both sides.
0.3x-9=3
Combine 0.4x and -0.1x to get 0.3x.
0.3x=3+9
Add 9 to both sides.
0.3x=12
Add 3 and 9 to get 12.
x=\frac{12}{0.3}
Divide both sides by 0.3.
x=\frac{120}{3}
Expand \frac{12}{0.3} by multiplying both numerator and the denominator by 10.
x=40
Divide 120 by 3 to get 40.
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