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Simplifying (2n + -4) + (n + 1) = 90 Reorder the terms: (-4 + 2n) + (n + 1) = 90 Remove parenthesis around (-4 + 2n) -4 + 2n + (n + 1) = 90 Reorder the terms: -4 + 2n + (1 + n) = 90 Remove parenthesis around (1 + n) -4 + 2n + 1 + n = 90 Reorder the terms: -4 + 1 + 2n + n = 90 Combine like terms: -4 + 1 = -3 -3 + 2n + n = 90 Combine like terms: 2n + n = 3n -3 + 3n = 90 Solving -3 + 3n = 90 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 3n = 90 + 3 Combine like terms: -3 + 3 = 0 0 + 3n = 90 + 3 3n = 90 + 3 Combine like terms: 90 + 3 = 93 3n = 93 Divide each side by '3'. n = 31 Simplifying n = 31
| (10a-4a).2=12a | | 5a-3b+9ca=4 | | 99/1345 | | 2x-5+4x+10=180 | | 3*2*2*2*2-4(2+8)= | | 1345/99 | | -b=-5 | | A/5=1 | | 2x-5+4x+1=180 | | -5x-5=2+2x | | (x+1.5)(x+0.3)(x-1.75)= | | 100+20m= | | 6v=11/17 | | -27=n-19 | | 1/4y-6=10 | | 7a^2-24a+20=0 | | 4x+10x-5x=9x | | 1/4y-=10 | | V/6=11/17 | | 5/4R=1/X | | -8=10x+12 | | -12+2.5y= | | 10x^3-25x^2=4x-10 | | y=4x^2+22x | | -b+3b+2b=4 | | -20=2(x+2)-5y | | 7y+6=9y-24-1 | | 6x(5-3)= | | X/-3-13=6 | | 4/11x100= | | 3x-8+7x+3=55 | | -2+4x=-4+x |