+129840 4.21x + 5.39 = 12.07(2.01 - 4.72x) multipy through by 100 to help clear some decimals
421x + 539 = 1207 (2.01 - 4.72x) simplify the right side
421x + 539 = 2426.07 - 5697.04x add 5697.04 to both sides, subtract 539 from both sides
6118.04 x = 1887.07 divide both sides by 6118.04
x = 1887.07 / 6118.04
