Find the expression

Question

0.5(x-10)+o.7(x+20)=57

Answer 1

0.5(x - 10) + 0.7(x + 20) = 57

5(x - 10) + 7(x + 20) = 570        multiply both sides by 10

5x - 50 + 7x + 140 = 570           distribute

12x + 90 = 570                           combine like terms

12x = 480                                   subtract 90 from both sides

x = 40                                         divide both sides by 12