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2x= - 15 + 13
2x= -2
X= -2/2
X= -1
Comprobación
2x-13= -15
-2- 13= -15
-15 = -15
2. 20= 3x -5 * (-4)
20= 3x + 20
3x+20= 20
3x= 20-20
3x= 0
X= 0/3
X= 0
COMPROBACIÓN
matemático: Explicación paso a paso:
20=3*0+-5*(-4)
20=0+-5*-4
20=0+20
3. (3*4)- (5*6)= 2x+ 7x
12- 30= 9x
9x= 12-30
X= - 18/9
X= - 2
COMPROBACIÓN
1*12+-1*(5*6)=2*(-2)+7*(-2)
12+-1*30=2*(-2)+7*(-2)
-18=2*-2+7*(-2)
-18=-4+7*-2
-18=-4+7*-2
-18=-4+-14
-18=-18
4. 3x-6= (-9x) / 3 + 12
3*x+-6=1*(-9*x)/3+12
3*x+-6=1*(-3*x)/1+12
3*x+-6=1*-3*x+12
6*x+-6=12
6*x=18
x=3
COMPROBACIÓN
3*3+-6=1*(-9*3)/3+12
3*3+-6=1*(-9*3)/3+12
9+-6=1*(-9*3)/3+12
3=1*-27/3+12
3=1*-9/1+12
3=1*-9+12
3=-9+12
3= 3
5. -8x-6+ x + 8 = -31+ 3x -7
-8*x+1*x+-6+8=-31+3*x+-7
-7+1*x+2=-31+3*x+-7
-7*x+2=3*x+-31+-7
-10*x+2=-38
-10*x=-40
1*x=4
COMPROBACIÓN
-8*4+-6+4+8=-31+3*(4)+-7
-8*4+-6+4+8=-31+3*(4)+-7
-32+-6+4+8=-31+3*(4)+-7
-32+-6+12=-31+3*(4)+-7
-26=-31+3*4+-7
-26=-31+3*4+-7
-26=-31+12+-7
-26=-31+5
-26=-26