13x-(-2x)+45-(-21)-7x=

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Solution for 13x-(-2x)+45-(-21)-7x= equation:


Simplifying
13x + -1(-2x) + 45 + -1(-21) + -7x = 0

Remove parenthesis around (-2x)
13x + -1 * -2x + 45 + -1(-21) + -7x = 0

Multiply -1 * -2
13x + 2x + 45 + -1(-21) + -7x = 0

Multiply -1 * -21
13x + 2x + 45 + 21 + -7x = 0

Reorder the terms:
45 + 21 + 13x + 2x + -7x = 0

Combine like terms: 45 + 21 = 66
66 + 13x + 2x + -7x = 0

Combine like terms: 13x + 2x = 15x
66 + 15x + -7x = 0

Combine like terms: 15x + -7x = 8x
66 + 8x = 0

Solving
66 + 8x = 0

Solving for variable 'x'.

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

Add '-66' to each side of the equation.
66 + -66 + 8x = 0 + -66

Combine like terms: 66 + -66 = 0
0 + 8x = 0 + -66
8x = 0 + -66

Combine like terms: 0 + -66 = -66
8x = -66

Divide each side by '8'.
x = -8.25

Simplifying
x = -8.25

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