Explanation:
Make x the subject of h=4(x+3y)+2
h = 4(x + 3y) + 2
perform multiplication on right side:
h = 4x + 12y + 2
subtract 12 y - 2 from both sides:
h - 12 y - 2= 4x + 12y + 2 - 12 y - 2
h - 12 y - 2= 4x
so flipping the equation:
4x = h - 12 y + 2
divide both sides by 4:
4x/4 = (h - 12 y - 2)/4
x = h/4 - 3y - 1/2