.40(7)=.70(7+x)

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Solution for .40(7)=.70(7+x) equation:


Simplifying
0.40(7) = 0.70(7 + x)

Multiply 0.40 * 7
2.8 = 0.70(7 + x)
2.8 = (7 * 0.70 + x * 0.70)
2.8 = (4.9 + 0.70x)

Solving
2.8 = 4.9 + 0.70x

Solving for variable 'x'.

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

Add '-0.70x' to each side of the equation.
2.8 + -0.70x = 4.9 + 0.70x + -0.70x

Combine like terms: 0.70x + -0.70x = 0.00
2.8 + -0.70x = 4.9 + 0.00
2.8 + -0.70x = 4.9

Add '-2.8' to each side of the equation.
2.8 + -2.8 + -0.70x = 4.9 + -2.8

Combine like terms: 2.8 + -2.8 = 0.0
0.0 + -0.70x = 4.9 + -2.8
-0.70x = 4.9 + -2.8

Combine like terms: 4.9 + -2.8 = 2.1
-0.70x = 2.1

Divide each side by '-0.70'.
x = -3

Simplifying
x = -3

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