First, subtract color(red)(AL) from each side of the equation to isolate the term containing the G while keeping the equation balanced:
AL + G/EB - color(red)(AL) = R + A - color(red)(AL)
AL - color(red)(AL) + G/EB = R + A - AL
0 + G/EB = R + A - AL
G/EB = R + A - AL
Now, multiply each side of the equation by color(red)(E)/color(blue)(B) to solve for G while keeping the equation balanced:
color(red)(E)/color(blue)(B) * G/EB = color(red)(E)/color(blue)(B)(R + A - AL)
cancel(color(red)(E))/cancel(color(blue)(B)) * G/color(red)(cancel(color(black)(E)))color(blue)(cancel(color(black)(B))) = color(red)(E)/color(blue)(B)(R + A - AL)
G = color(red)(E)/color(blue)(B)(R + A - AL)
Or
G = (color(red)(E)(R + A - AL))/B
Or
G = (ER + EA - EAL)/B
Or
G = (ER)/B + (EA)/B - (EAL)/B