Solve for x
x = \frac{90}{7} = 12\frac{6}{7} \approx 12.857142857
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4x+3x+90=180
Combine x and 3x to get 4x.
7x+90=180
Combine 4x and 3x to get 7x.
7x=180-90
Subtract 90 from both sides.
7x=90
Subtract 90 from 180 to get 90.
x=\frac{90}{7}
Divide both sides by 7.
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