0.3(20+70)+0.7(20+-60)=-1

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Solution for 0.3(20+70)+0.7(20+-60)=-1 equation: 


Simplifying
0.3(20 + 70) + 0.7(20 + -60) = -1

Combine like terms: 20 + 70 = 90
0.3(90) + 0.7(20 + -60) = -1

Multiply 0.3 * 90
27 + 0.7(20 + -60) = -1

Combine like terms: 20 + -60 = -40
27 + 0.7(-40) = -1

Multiply 0.7 * -40
27 + -28 = -1

Combine like terms: 27 + -28 = -1
-1 = -1

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

Combine like terms: -1 + 1 = 0
0 = -1 + 1

Combine like terms: -1 + 1 = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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