55+7(x-1)=90

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Solution for 55+7(x-1)=90 equation:


Simplifying
55 + 7(x + -1) = 90

Reorder the terms:
55 + 7(-1 + x) = 90
55 + (-1 * 7 + x * 7) = 90
55 + (-7 + 7x) = 90

Combine like terms: 55 + -7 = 48
48 + 7x = 90

Solving
48 + 7x = 90

Solving for variable 'x'.

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

Add '-48' to each side of the equation.
48 + -48 + 7x = 90 + -48

Combine like terms: 48 + -48 = 0
0 + 7x = 90 + -48
7x = 90 + -48

Combine like terms: 90 + -48 = 42
7x = 42

Divide each side by '7'.
x = 6

Simplifying
x = 6

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