70=90-x

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Solution for 70=90-x equation:


Simplifying
70 = 90 + -1x

Solving
70 = 90 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
70 + x = 90 + -1x + x

Combine like terms: -1x + x = 0
70 + x = 90 + 0
70 + x = 90

Add '-70' to each side of the equation.
70 + -70 + x = 90 + -70

Combine like terms: 70 + -70 = 0
0 + x = 90 + -70
x = 90 + -70

Combine like terms: 90 + -70 = 20
x = 20

Simplifying
x = 20

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