Question

3x + x + 20 + 50 = 180

Answer 1

3x + x + 20 + 50 = 180
4x + 70 = 180
4x = 180 - 70
4x =110
x = 110/4
or, 27.5

Answer 2

$\bf\purple{3x + x + 20 + 50 = 180}$

$\bf \: 4x + 70 = 180$

$\bf \: 4x = 180 - 70$

$\bf \: 4x = 110$

$\bf \: x =\frac{110}{4}$

$\bf \: x = \frac{55}{2}$

${\underline{\boxed{\bf\purple{x = 27.5}}}}$