The equation 5x plus 7 times 18 is know as a verbal sentence. This is a math problem.
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5x + 3 = 18 Subtract 3 from both sides: 5x = 15 Divide by 5: x = 3.
4x+12-5x-30=-x-18
(5x-6)(x-3)
-10x + 5x = -5x
First collect like terms in the second equation: 5x - 18 = 4y - 3y ie y = 5x - 18 Substitute this for the term in y in the first equation, getting 3x + 2(5x - 18) = 16 ie 3x + 10x - 36 = 16 ie 13x = 16 + 36 so x = 4 and y = 5 x 4 - 18 ie 2.