IGCSE Maths Edexcel A 4MA1

solve linear equations, with integer or fractional coefficients, in one unknown in which the unknown appears on either side or both sides of the equation

$5x + 8 = 12$

$7(x+3) = 5x - 8$

$\dfrac{4x+5}{2} = 3$

Higher only

$\dfrac{2x-3}{6} + \dfrac{x+2}{3} = \dfrac{5}{2}$

set up simple linear equations from given data

The three angles of a triangle are $a°$, $(a + 10)°$, $(a + 20)°$. Find the value of $a$