Answer:
x = 45
(2x-10) = 80
x+10 = 55
Step-by-step explanation:
so, make an equation to find x:
x+2x-10+x+10 = 180
collect like terms
4x = 180 (divide both sides by 4)
x = 45
sub into the formulas:
x- 10 = 45+10 = 55
2 × 45 - 10 = 80
add them together to see if it is correct:
45 + 55 + 80 = 180
