s+s+s+s+80+70=100

Solution for s+s+s+s+80+70=100 equation:

Simplifying
s + s + s + s + 80 + 70 = 100

Reorder the terms:
80 + 70 + s + s + s + s = 100

Combine like terms: 80 + 70 = 150
150 + s + s + s + s = 100

Combine like terms: s + s = 2s
150 + 2s + s + s = 100

Combine like terms: 2s + s = 3s
150 + 3s + s = 100

Combine like terms: 3s + s = 4s
150 + 4s = 100

Solving
150 + 4s = 100

Solving for variable 's'.

Move all terms containing s to the left, all other terms to the right.

Add '-150' to each side of the equation.
150 + -150 + 4s = 100 + -150

Combine like terms: 150 + -150 = 0
0 + 4s = 100 + -150
4s = 100 + -150

Combine like terms: 100 + -150 = -50
4s = -50

Divide each side by '4'.
s = -12.5

Simplifying
s = -12.5