100-3t+7t=30

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Solution for 100-3t+7t=30 equation: 


Simplifying
100 + -3t + 7t = 30

Combine like terms: -3t + 7t = 4t
100 + 4t = 30

Solving
100 + 4t = 30

Solving for variable 't'.

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

Add '-100' to each side of the equation.
100 + -100 + 4t = 30 + -100

Combine like terms: 100 + -100 = 0
0 + 4t = 30 + -100
4t = 30 + -100

Combine like terms: 30 + -100 = -70
4t = -70

Divide each side by '4'.
t = -17.5

Simplifying
t = -17.5

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