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5\left(4x+5\right)+30=-3\times 7x
Multiply both sides of the equation by 15, the least common multiple of 3,5.
20x+25+30=-3\times 7x
Use the distributive property to multiply 5 by 4x+5.
20x+55=-3\times 7x
Add 25 and 30 to get 55.
20x+55=-21x
Multiply -3 and 7 to get -21.
20x+55+21x=0
Add 21x to both sides.
41x+55=0
Combine 20x and 21x to get 41x.
41x=-55
Subtract 55 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-55}{41}
Divide both sides by 41.
x=-\frac{55}{41}
Fraction \frac{-55}{41} can be rewritten as -\frac{55}{41} by extracting the negative sign.