12x+21-30x+25=100

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Solution for 12x+21-30x+25=100 equation: 


Simplifying
12x + 21 + -30x + 25 = 100

Reorder the terms:
21 + 25 + 12x + -30x = 100

Combine like terms: 21 + 25 = 46
46 + 12x + -30x = 100

Combine like terms: 12x + -30x = -18x
46 + -18x = 100

Solving
46 + -18x = 100

Solving for variable 'x'.

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

Add '-46' to each side of the equation.
46 + -46 + -18x = 100 + -46

Combine like terms: 46 + -46 = 0
0 + -18x = 100 + -46
-18x = 100 + -46

Combine like terms: 100 + -46 = 54
-18x = 54

Divide each side by '-18'.
x = -3

Simplifying
x = -3

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