18=15y-(-2x+21)

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Solution for 18=15y-(-2x+21) equation:


Simplifying
18 = 15y + -1(-2x + 21)

Reorder the terms:
18 = 15y + -1(21 + -2x)
18 = 15y + (21 * -1 + -2x * -1)
18 = 15y + (-21 + 2x)

Reorder the terms:
18 = -21 + 2x + 15y

Solving
18 = -21 + 2x + 15y

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
18 + -2x = -21 + 2x + -2x + 15y

Combine like terms: 2x + -2x = 0
18 + -2x = -21 + 0 + 15y
18 + -2x = -21 + 15y

Add '-18' to each side of the equation.
18 + -18 + -2x = -21 + -18 + 15y

Combine like terms: 18 + -18 = 0
0 + -2x = -21 + -18 + 15y
-2x = -21 + -18 + 15y

Combine like terms: -21 + -18 = -39
-2x = -39 + 15y

Divide each side by '-2'.
x = 19.5 + -7.5y

Simplifying
x = 19.5 + -7.5y

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