.89=x+.3(7)

Solution for .89=x+.3(7) equation:

Simplifying
0.89 = x + 0.3(7)

Multiply 0.3 * 7
0.89 = x + 2.1

Reorder the terms:
0.89 = 2.1 + x

Solving
0.89 = 2.1 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
0.89 + -1x = 2.1 + x + -1x

Combine like terms: x + -1x = 0
0.89 + -1x = 2.1 + 0
0.89 + -1x = 2.1

Add '-0.89' to each side of the equation.
0.89 + -0.89 + -1x = 2.1 + -0.89

Combine like terms: 0.89 + -0.89 = 0.00
0.00 + -1x = 2.1 + -0.89
-1x = 2.1 + -0.89

Combine like terms: 2.1 + -0.89 = 1.21
-1x = 1.21

Divide each side by '-1'.
x = -1.21

Simplifying
x = -1.21